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demos.lib
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//#################################### demos.lib ##########################################
// This library contains a set of demo functions based on examples located in the
// `/examples` folder. Its official prefix is `dm`.
//
// #### References
// * <https://github.com/grame-cncm/faustlibraries/blob/master/demos.lib>
//########################################################################################
/************************************************************************
************************************************************************
FAUST library file, GRAME section
Except where noted otherwise, Copyright (C) 2003-2017 by GRAME,
Centre National de Creation Musicale.
----------------------------------------------------------------------
GRAME LICENSE
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.
EXCEPTION TO THE LGPL LICENSE : As a special exception, you may create a
larger FAUST program which directly or indirectly imports this library
file and still distribute the compiled code generated by the FAUST
compiler, or a modified version of this compiled code, under your own
copyright and license. This EXCEPTION TO THE LGPL LICENSE explicitly
grants you the right to freely choose the license for the resulting
compiled code. In particular the resulting compiled code has no obligation
to be LGPL or GPL. For example you are free to choose a commercial or
closed source license or any other license if you decide so.
************************************************************************
************************************************************************/
ma = library("maths.lib");
ba = library("basics.lib");
de = library("delays.lib");
si = library("signals.lib");
an = library("analyzers.lib");
fi = library("filters.lib");
os = library("oscillators.lib");
no = library("noises.lib");
ef = library("misceffects.lib");
co = library("compressors.lib");
ve = library("vaeffects.lib");
pf = library("phaflangers.lib");
re = library("reverbs.lib");
en = library("envelopes.lib");
it = library("interpolators.lib");
aa = library("aanl.lib");
sp = library("spats.lib");
declare name "Faust Demos Library";
declare version "1.2.0";
//########################################################################################
/************************************************************************
FAUST library file, jos section
Except where noted otherwise, The Faust functions below in this
section are Copyright (C) 2003-2019 by Julius O. Smith III <[email protected]>
([jos](http://ccrma.stanford.edu/~jos/)), and released under the
(MIT-style) [STK-4.3](#stk-4.3-license) license.
MarkDown comments in this section are Copyright 2016-2019 by Romain
Michon and Julius O. Smith III, and are released under the
[CCA4I](https://creativecommons.org/licenses/by/4.0/) license (TODO: if/when Romain agrees!)
************************************************************************/
//====================================Analyzers===========================================
//========================================================================================
//----------------------`(dm.)mth_octave_spectral_level_demo`----------------------
// Demonstrate mth_octave_spectral_level in a standalone GUI.
//
// #### Usage
// ```
// _ : mth_octave_spectral_level_demo(BandsPerOctave) : _
// _ : spectral_level_demo : _ // 2/3 octave
// ```
//------------------------------------------------------------
declare mth_octave_spectral_level_demo author "Julius O. Smith III and Yann Orlarey";
declare mth_octave_spectral_level_demo licence "MIT";
mth_octave_spectral_level_demo(BPO) = an.mth_octave_spectral_level_default(M,ftop,N,tau,dB_offset)
with{
M = BPO;
ftop = 16000;
Noct = 10; // number of octaves down from ftop
// Lowest band-edge is at ftop*2^(-Noct+2) = 62.5 Hz when ftop=16 kHz:
N = int(Noct*M); // without 'int()', segmentation fault observed for M=1.67
ctl_group(x) = hgroup("[1] SPECTRUM ANALYZER CONTROLS", x);
tau = ctl_group(hslider("[0] Level Averaging Time [unit:ms] [scale:log]
[tooltip: band-level averaging time in milliseconds]",
100,1,10000,1)) * 0.001;
dB_offset = ctl_group(hslider("[1] Level dB Offset [unit:dB]
[tooltip: Level offset in decibels]",
50,-50,100,1));
};
spectral_level_demo = mth_octave_spectral_level_demo(1.5); // 2/3 octave
//======================================Filters===========================================
//========================================================================================
//--------------------------`(dm.)parametric_eq_demo`------------------------------
// A parametric equalizer application.
//
// #### Usage:
//
// ```
// _ : parametric_eq_demo : _
// ```
//------------------------------------------------------------
declare parametric_eq_demo author "Julius O. Smith III";
declare parametric_eq_demo licence "MIT";
parametric_eq_demo = fi.low_shelf(LL,FL) : fi.peak_eq(LP,FP,BP) : fi.high_shelf(LH,FH)
with{
eq_group(x) = hgroup("[0] PARAMETRIC EQ SECTIONS [tooltip: See Faust's filters.lib
for info and pointers]",x);
ls_group(x) = eq_group(vgroup("[1] Low Shelf",x));
LL = ls_group(hslider("[0] Low Boost|Cut [unit:dB] [style:knob]
[tooltip: Amount of low-frequency boost or cut in decibels]",0,-40,40,0.1));
FL = ls_group(hslider("[1] Transition Frequency [unit:Hz] [style:knob] [scale:log]
[tooltip: Transition-frequency from boost (cut) to unity gain]",200,1,5000,1));
pq_group(x) = eq_group(vgroup("[2] Peaking Equalizer[tooltip: Parametric Equalizer
sections from filters.lib]",x));
LP = pq_group(hslider("[0] Peak Boost|Cut [unit:dB] [style:knob][tooltip: Amount of
local boost or cut in decibels]",0,-40,40,0.1));
FP = pq_group(hslider("[1] Peak Frequency [unit:PK] [style:knob] [tooltip: Peak
Frequency in Piano Key (PK) units (A440 = 49PK)]",49,1,100,1)) : si.smooth(0.999)
: ba.pianokey2hz;
Q = pq_group(hslider("[2] Peak Q [style:knob] [scale:log] [tooltip: Quality factor
(Q) of the peak = center-frequency/bandwidth]",40,1,1000,0.1));
BP = FP/Q;
hs_group(x) = eq_group(vgroup("[3] High Shelf [tooltip: A high shelf provides a boost
or cut above some frequency]",x));
LH = hs_group(hslider("[0] High Boost|Cut [unit:dB] [style:knob] [tooltip: Amount of
high-frequency boost or cut in decibels]",0,-40,40,.1));
FH = hs_group(hslider("[1] Transition Frequency [unit:Hz] [style:knob] [scale:log]
[tooltip: Transition-frequency from boost (cut) to unity gain]",8000,20,10000,1));
};
//-------------------`(dm.)spectral_tilt_demo`-----------------------
// A spectral tilt application.
//
// #### Usage
//
// ```
// _ : spectral_tilt_demo(N) : _
// ```
//
// Where:
//
// * `N`: filter order (integer)
//
// All other parameters interactive
//------------------------------------------------------------
declare spectral_tilt_demo author "Julius O. Smith III";
declare spectral_tilt_demo licence "MIT";
spectral_tilt_demo(N) = fi.spectral_tilt(O,f0,bw,alpha)
with{
O = N;
alpha = hslider("[1] Slope of Spectral Tilt across Band",-1/2,-1,1,0.001);
f0 = hslider("[2] Band Start Frequency [unit:Hz]",100,20,10000,1);
bw = hslider("[3] Band Width [unit:Hz]",5000,100,10000,1);
};
//---------`(dm.)mth_octave_filterbank_demo` and `(dm.)filterbank_demo`-------------
// Graphic Equalizer: each filter-bank output signal routes through a fader.
//
// #### Usage
//
// ```
// _ : mth_octave_filterbank_demo(M) : _
// _ : filterbank_demo : _
// ```
//
// Where:
//
// * `M`: number of bands per octave
//--------------------------------------------------------------
declare mth_octave_filterbank_demo author "Julius O. Smith III";
declare mth_octave_filterbank_demo licence "MIT";
mth_octave_filterbank_demo(O) = bp1(bp,mthoctavefilterbankdemo)
with{
M = O;
bp1 = ba.bypass1;
mofb_group(x) = vgroup("CONSTANT-Q FILTER BANK (Butterworth dyadic tree)
[tooltip: See Faust's filters.lib for documentation and references]", x);
bypass_group(x) = mofb_group(hgroup("[0]", x));
slider_group(x) = mofb_group(hgroup("[1]", x));
N = 10*M; // total number of bands (highpass band, octave-bands, dc band)
ftop = 10000;
mthoctavefilterbankdemo = chan;
chan = fi.mth_octave_filterbank_default(M,ftop,N) : sum(i,N,(*(ba.db2linear(fader(N-i)))));
fader(i) = slider_group(vslider("Band%2i [unit:dB] [tooltip: Bandpass filter
gain in dB]", -10, -70, 10, 0.1)) : si.smoo;
bp = bypass_group(checkbox("[0] Bypass
[tooltip: When this is checked, the filter-bank has no effect]"));
};
filterbank_demo = mth_octave_filterbank_demo(1); // octave-bands = default
//======================================Effects===========================================
//========================================================================================
//---------------------------`(dm.)cubicnl_demo`--------------------------
// Distortion demo application.
//
// #### Usage:
//
// ```
// _ : cubicnl_demo : _
// ```
//------------------------------------------------------------
declare cubicnl_demo author "Julius O. Smith III";
declare cubicnl_demo licence "MIT";
cubicnl_demo = ba.bypass1(bp, ef.cubicnl_nodc(drive:si.smoo,offset:si.smoo))
with{
cnl_group(x) = vgroup("CUBIC NONLINEARITY cubicnl [tooltip: Reference:
https://ccrma.stanford.edu/~jos/pasp/Cubic_Soft_Clipper.html]", x);
bp = cnl_group(checkbox("[0] Bypass [tooltip: When this is checked, the
nonlinearity has no effect]"));
drive = cnl_group(hslider("[1] Drive [tooltip: Amount of distortion]",
0, 0, 1, 0.01));
offset = cnl_group(hslider("[2] Offset [tooltip: Brings in even harmonics]",
0, 0, 1, 0.01));
};
//----------------------------`(dm.)gate_demo`-------------------------
// Gate demo application.
//
// #### Usage
//
// ```
// _,_ : gate_demo : _,_
// ```
//------------------------------------------------------------
declare gate_demo author "Julius O. Smith III";
declare gate_demo licence "MIT";
gate_demo = ba.bypass2(gbp,gate_stereo_demo)
with{
gate_group(x) = vgroup("GATE [tooltip: Reference:
http://en.wikipedia.org/wiki/Noise_gate]", x);
meter_group(x) = gate_group(hgroup("[0]", x));
knob_group(x) = gate_group(hgroup("[1]", x));
gbp = meter_group(checkbox("[0] Bypass [tooltip: When this is checked,
the gate has no effect]"));
gateview = ef.gate_gain_mono(gatethr,gateatt,gatehold,gaterel) : ba.linear2db :
meter_group(hbargraph("[1] Gate Gain [unit:dB] [tooltip: Current gain of the
gate in dB]", -50,+10)); // [style:led]
gate_stereo_demo(x,y) = attach(x,gateview(abs(x)+abs(y))),y :
ef.gate_stereo(gatethr,gateatt,gatehold,gaterel);
gatethr = knob_group(hslider("[1] Threshold [unit:dB] [style:knob] [tooltip: When
the signal level falls below the Threshold (expressed in dB), the signal is
muted]", -30, -120, 0, 0.1));
gateatt = knob_group(hslider("[2] Attack [unit:us] [style:knob] [scale:log]
[tooltip: Time constant in MICROseconds (1/e smoothing time) for the gate
gain to go (exponentially) from 0 (muted) to 1 (unmuted)]",
10, 10, 10000, 1)) : *(0.000001) : max(1.0/float(ma.SR));
gatehold = knob_group(hslider("[3] Hold [unit:ms] [style:knob] [scale:log]
[tooltip: Time in ms to keep the gate open (no muting) after the signal
level falls below the Threshold]", 200, 1, 1000, 1)) : *(0.001) :
max(1.0/float(ma.SR));
gaterel = knob_group(hslider("[4] Release [unit:ms] [style:knob] [scale:log]
[tooltip: Time constant in ms (1/e smoothing time) for the gain to go
(exponentially) from 1 (unmuted) to 0 (muted)]",
100, 1, 1000, 1)) : *(0.001) : max(1.0/float(ma.SR));
};
//----------------------------`(dm.)compressor_demo`-------------------------
// Compressor demo application.
//
// #### Usage
//
// ```
// _,_ : compressor_demo : _,_
// ```
//------------------------------------------------------------
declare compressor_demo author "Julius O. Smith III";
declare compressor_demo licence "MIT";
compressor_demo = ba.bypass2(cbp,compressor_stereo_demo)
with{
comp_group(x) = vgroup("COMPRESSOR [tooltip: Reference:
http://en.wikipedia.org/wiki/Dynamic_range_compression]", x);
meter_group(x) = comp_group(hgroup("[0]", x));
knob_group(x) = comp_group(hgroup("[1]", x));
cbp = meter_group(checkbox("[0] Bypass [tooltip: When this is checked, the compressor
has no effect]"));
gainview = co.compression_gain_mono(ratio,threshold,attack,release) : ba.linear2db :
meter_group(hbargraph("[1] Compressor Gain Before Makeup [unit:dB] [tooltip: Current gain of
the compressor in dB]",-50,+10));
displaygain = _,_ <: _,_,(abs,abs:+) : _,_,gainview : _,attach;
compressor_stereo_demo =
displaygain(co.compressor_stereo(ratio,threshold,attack,release)) :
*(makeupgain), *(makeupgain);
ctl_group(x) = knob_group(hgroup("[3] Compression Control", x));
ratio = ctl_group(hslider("[0] Ratio [style:knob]
[tooltip: A compression Ratio of N means that for each N dB increase in input
signal level above Threshold, the output level goes up 1 dB]",
5, 1, 20, 0.1));
threshold = ctl_group(hslider("[1] Threshold [unit:dB] [style:knob]
[tooltip: When the signal level exceeds the Threshold (in dB), its level
is compressed according to the Ratio]",
-30, -100, 10, 0.1));
env_group(x) = knob_group(hgroup("[4] Compression Response", x));
attack = env_group(hslider("[1] Attack [unit:ms] [style:knob] [scale:log]
[tooltip: Time constant in ms (1/e smoothing time) for the compression gain
to approach (exponentially) a new lower target level (the compression
`kicking in')]", 50, 1, 1000, 0.1)) : *(0.001) : max(1/ma.SR);
release = env_group(hslider("[2] Release [unit:ms] [style: knob] [scale:log]
[tooltip: Time constant in ms (1/e smoothing time) for the compression gain
to approach (exponentially) a new higher target level (the compression
'releasing')]", 500, 1, 1000, 0.1)) : *(0.001) : max(1/ma.SR);
makeupgain = comp_group(hslider("[5] Makeup Gain [unit:dB]
[tooltip: The compressed-signal output level is increased by this amount
(in dB) to make up for the level lost due to compression]",
40, -96, 96, 0.1)) : ba.db2linear;
};
//-------------------------`(dm.)moog_vcf_demo`---------------------------
// Illustrate and compare all three Moog VCF implementations above.
//
// #### Usage
//
// ```
// _ : moog_vcf_demo : _
// ```
//------------------------------------------------------------
declare moog_vcf_demo author "Julius O. Smith III";
declare moog_vcf_demo licence "MIT";
moog_vcf_demo = ba.bypass1(bp,vcf)
with{
mvcf_group(x) = hgroup("MOOG VCF (Voltage Controlled Filter) [tooltip: See Faust's
vaeffects.lib for info and references]",x);
cb_group(x) = mvcf_group(hgroup("[0]",x));
bp = cb_group(checkbox("[0] Bypass [tooltip: When this is checked, the Moog VCF
has no effect]"));
archsw = cb_group(checkbox("[1] Use Biquads [tooltip: Select moog_vcf_2b (two-biquad)
implementation, instead of the default moog_vcf (analog style) implementation]"));
bqsw = cb_group(checkbox("[2] Normalized Ladders [tooltip: If using biquads, make
them normalized ladders (moog_vcf_2bn)]"));
freq = mvcf_group(hslider("[1] Corner Frequency [unit:PK] [tooltip: The VCF resonates
at the corner frequency (specified in PianoKey (PK) units, with A440 = 49 PK).
The VCF response is flat below the corner frequency, and rolls off -24 dB per
octave above.]",
25, 1, 88, 0.01) : ba.pianokey2hz) : si.smoo;
res = mvcf_group(hslider("[2] Corner Resonance [style:knob] [tooltip: Amount of
resonance near VCF corner frequency (specified between 0 and 1)]", 0.9, 0, 1, 0.01));
outgain = mvcf_group(hslider("[3] VCF Output Level [unit:dB] [style:knob] [tooltip:
output level in decibels]", 5, -60, 20, 0.1)) : ba.db2linear : si.smoo;
vcfbq = _ <: select2(bqsw, ve.moog_vcf_2b(res,freq), ve.moog_vcf_2bn(res,freq));
vcfarch = _ <: select2(archsw, ve.moog_vcf(res^4,freq), vcfbq);
vcf = vcfarch : *(outgain);
};
//-------------------------`(dm.)wah4_demo`---------------------------
// Wah pedal application.
//
// #### Usage
//
// ```
// _ : wah4_demo : _
// ```
//------------------------------------------------------------
declare wah4_demo author "Julius O. Smith III";
declare wah4_demo licence "MIT";
wah4_demo = ba.bypass1(bp, ve.wah4(fr))
with{
wah4_group(x) = hgroup("WAH4 [tooltip: Fourth-order wah effect made using moog_vcf]", x);
bp = wah4_group(checkbox("[0] Bypass [tooltip: When this is checked, the wah pedal has
no effect]"));
fr = wah4_group(hslider("[1] Resonance Frequency [scale:log] [tooltip: wah resonance
frequency in Hz]", 200,100,2000,1));
// Avoid dc with the moog_vcf (amplitude too high when freq comes up from dc)
// Also, avoid very high resonance frequencies (e.g., 5kHz or above).
};
//-------------------------`(dm.)crybaby_demo`---------------------------
// Crybaby effect application.
//
// #### Usage
//
// ```
// _ : crybaby_demo : _
// ```
//------------------------------------------------------------
declare crybaby_demo author "Julius O. Smith III";
declare crybaby_demo licence "MIT";
crybaby_demo = ba.bypass1(bp, ve.crybaby(wah))
with{
crybaby_group(x) = hgroup("CRYBABY [tooltip: Reference:
https://ccrma.stanford.edu/~jos/pasp/vegf.html]", x);
bp = crybaby_group(checkbox("[0] Bypass [tooltip: When this is checked, the wah
pedal has no effect]"));
wah = crybaby_group(hslider("[1] Wah parameter [tooltip: wah pedal angle between
0 (rocked back) and 1 (rocked forward)]",0.8,0,1,0.01));
};
//-------------------------`(dm.)flanger_demo`---------------------------
// Flanger effect application.
//
// #### Usage
//
// ```
// _,_ : flanger_demo : _,_
// ```
//------------------------------------------------------------
declare flanger_demo author "Julius O. Smith III";
declare flanger_demo licence "MIT";
flanger_demo = ba.bypass2(fbp,flanger_stereo_demo)
with{
flanger_group(x) = vgroup("FLANGER
[tooltip: Reference: https://ccrma.stanford.edu/~jos/pasp/Flanging.html]", x);
meter_group(x) = flanger_group(hgroup("[0]", x));
ctl_group(x) = flanger_group(hgroup("[1]", x));
del_group(x) = flanger_group(hgroup("[2] Delay Controls", x));
lvl_group(x) = flanger_group(hgroup("[3]", x));
fbp = meter_group(checkbox("[0] Bypass [tooltip: When this is checked, the flanger
has no effect]"));
invert = meter_group(checkbox("[1] Invert Flange Sum"));
// FIXME: This should be an amplitude-response display:
flangeview = lfor(freq) + lfol(freq) : meter_group(hbargraph("[2] Flange LFO
[style: led] [tooltip: Display sum of flange delays]", -1.5,+1.5));
flanger_stereo_demo(x,y) = attach(x,flangeview),y :
*(level),*(level) : pf.flanger_stereo(dmax,curdel1,curdel2,depth,fb,invert);
lfol = os.oscrs;
lfor = os.oscrc;
dmax = 2048;
dflange = 0.001 * ma.SR *
del_group(hslider("[1] Flange Delay [unit:ms] [style:knob]", 10, 0, 20, 0.001));
odflange = 0.001 * ma.SR *
del_group(hslider("[2] Delay Offset [unit:ms] [style:knob]", 1, 0, 20, 0.001));
freq = ctl_group(hslider("[1] Speed [unit:Hz] [style:knob]", 0.5, 0, 10, 0.01));
depth = ctl_group(hslider("[2] Depth [style:knob]", 1, 0, 1, 0.001));
fb = ctl_group(hslider("[3] Feedback [style:knob]", 0, -0.999, 0.999, 0.001));
level = lvl_group(hslider("Flanger Output Level [unit:dB]", 0, -60, 10, 0.1)) :
ba.db2linear;
curdel1 = odflange+dflange*(1 + lfol(freq))/2;
curdel2 = odflange+dflange*(1 + lfor(freq))/2;
};
//-------------------------`(dm.)phaser2_demo`---------------------------
// Phaser effect demo application.
//
// #### Usage
//
// ```
// _,_ : phaser2_demo : _,_
// ```
//------------------------------------------------------------
declare phaser2_demo author "Julius O. Smith III";
declare phaser2_demo licence "MIT";
phaser2_demo = ba.bypass2(pbp,phaser2_stereo_demo)
with{
phaser2_group(x) = vgroup("PHASER2 [tooltip: Reference:
https://ccrma.stanford.edu/~jos/pasp/Flanging.html]", x);
meter_group(x) = phaser2_group(hgroup("[0]", x));
ctl_group(x) = phaser2_group(hgroup("[1]", x));
nch_group(x) = phaser2_group(hgroup("[2]", x));
lvl_group(x) = phaser2_group(hgroup("[3]", x));
pbp = meter_group(checkbox("[0] Bypass [tooltip: When this is checked, the phaser
has no effect]"));
invert = meter_group(checkbox("[1] Invert Internal Phaser Sum"));
vibr = meter_group(checkbox("[2] Vibrato Mode")); // In this mode you can hear any "Doppler"
// FIXME: This should be an amplitude-response display:
// flangeview = phaser2_amp_resp : meter_group(hspectrumview("[2] Phaser Amplitude Response", 0,1));
// phaser2_stereo_demo(x,y) = attach(x,flangeview),y : ...
phaser2_stereo_demo = *(level),*(level) :
pf.phaser2_stereo(Notches,width,frqmin,fratio,frqmax,speed,mdepth,fb,invert);
Notches = 4; // Compile-time parameter: 2 is typical for analog phaser stomp-boxes
// FIXME: Add tooltips
speed = ctl_group(hslider("[1] Speed [unit:Hz] [style:knob]", 0.5, 0, 10, 0.001));
depth = ctl_group(hslider("[2] Notch Depth (Intensity) [style:knob]", 1, 0, 1, 0.001));
fb = ctl_group(hslider("[3] Feedback Gain [style:knob]", 0, -0.999, 0.999, 0.001));
width = nch_group(hslider("[1] Notch width [unit:Hz] [style:knob] [scale:log]",
1000, 10, 5000, 1));
frqmin = nch_group(hslider("[2] Min Notch1 Freq [unit:Hz] [style:knob] [scale:log]",
100, 20, 5000, 1));
frqmax = nch_group(hslider("[3] Max Notch1 Freq [unit:Hz] [style:knob] [scale:log]",
800, 20, 10000, 1)) : max(frqmin);
fratio = nch_group(hslider("[4] Notch Freq Ratio: NotchFreq(n+1)/NotchFreq(n) [style:knob]",
1.5, 1.1, 4, 0.001));
level = lvl_group(hslider("Phaser Output Level [unit:dB]", 0, -60, 10, 0.1)) :
ba.db2linear;
mdepth = select2(vibr,depth,2); // Improve "ease of use"
};
//-------------------------`(dm.)tapeStop_demo`---------------------------
// Stereo tape-stop effect.
//
// #### Usage
//
// ```
// _,_ : tapeStop_demo : _,_
// ```
//------------------------------------------------------------
declare tapeStop_demo author "David Braun";
declare tapeStop_demo copyright "Copyright (C) 2024 by David Braun <[email protected]>";
declare tapeStop_demo license "MIT-style STK-4.3 license";
tapeStop_demo = hgroup("Tape Stop", ef.tapeStop(2, LAGRANGE_ORDER, MAX_TIME_SAMP, crossfade, gainAlpha, stopAlpha, stopTime, stop))
with {
LAGRANGE_ORDER = 3;
MAX_TIME_SEC = 4;
MIN_TIME_SEC = 0.01;
MIN_ALPHA = .01;
MAX_ALPHA = 2;
MAX_TIME_SAMP = MAX_TIME_SEC : ba.sec2samp;
msec2samp = _/1000 : ba.sec2samp;
stop = checkbox("[0] Stop");
stopTime = hslider("[1] Stop Time [style:knob][unit:ms]", 100, MIN_TIME_SEC*1000, MAX_TIME_SEC*1000, 1) : msec2samp;
stopAlpha = hslider("[2] Stop Alpha [style:knob][tooltip:Alpha==1 represents a linear deceleration (constant force). Alpha<1 represents an initially weaker, then stronger force. Alpha>1 represents an initially stronger, then weaker force.]", 1, MIN_ALPHA, MAX_ALPHA, .01);
gainAlpha = hslider("[3] Gain Alpha [style:knob][tooltip:During the tape-stop, lower alpha stays louder longer]", 1, MIN_ALPHA, MAX_ALPHA, .01);
crossfade = hslider("[4] Crossfade [style:knob][unit:ms][tooltip:Crossfade to apply when resuming normal playback.]", 3, 0, 125, 1) : msec2samp;
};
//======================================Reverbs===========================================
//========================================================================================
//----------------------------`(dm.)freeverb_demo`-------------------------
// Freeverb demo application.
//
// #### Usage
//
// ```
// _,_ : freeverb_demo : _,_
// ```
//------------------------------------------------------------
declare freeverb_demo author " Romain Michon";
declare freeverb_demo licence "LGPL";
freeverb_demo = _,_ <: (*(g)*fixedgain,*(g)*fixedgain :
re.stereo_freeverb(combfeed, allpassfeed, damping, spatSpread)),
*(1-g), *(1-g) :> _,_
with{
scaleroom = 0.28;
offsetroom = 0.7;
allpassfeed = 0.5;
scaledamp = 0.4;
fixedgain = 0.1;
origSR = 44100;
parameters(x) = hgroup("Freeverb",x);
knobGroup(x) = parameters(vgroup("[0]",x));
damping = knobGroup(vslider("[0] Damp [style: knob] [tooltip: Somehow control the
density of the reverb.]",0.5, 0, 1, 0.025)*scaledamp*origSR/ma.SR);
combfeed = knobGroup(vslider("[1] RoomSize [style: knob] [tooltip: The room size
between 0 and 1 with 1 for the largest room.]", 0.5, 0, 1, 0.025)*scaleroom*
origSR/ma.SR + offsetroom);
spatSpread = knobGroup(vslider("[2] Stereo Spread [style: knob] [tooltip: Spatial
spread between 0 and 1 with 1 for maximum spread.]",0.5,0,1,0.01)*46*ma.SR/origSR
: int);
g = parameters(vslider("[1] Wet [tooltip: The amount of reverb applied to the signal
between 0 and 1 with 1 for the maximum amount of reverb.]", 0.3333, 0, 1, 0.025));
};
//---------------------`(dm.)stereo_reverb_tester`--------------------
// Handy test inputs for reverberator demos below.
//
// #### Usage
//
// ```
// _,_ : stereo_reverb_tester(gui_group) : _,_
// ```
// For suppressing the `gui_group` input, pass it as `!`.
// (See `(dm.)fdnrev0_demo` for an example of its use).
//------------------------------------------------------------
declare stereo_reverb_tester author "Julius O. Smith III";
declare stereo_reverb_tester licence "MIT";
stereo_reverb_tester(revin_group,x,y) = reverb_tester(_,x,y)
with {
reverb_tester(revin_group,x,y) = inx,iny with {
ck_group(x) = revin_group(vgroup("[1] Input Config",x));
mutegain = 1 - ck_group(checkbox("[1] Mute Ext Inputs
[tooltip: When this is checked, the stereo external audio inputs are
disabled (good for hearing the impulse response or pink-noise response alone)]"));
pinkin = ck_group(checkbox("[2] Pink Noise
[tooltip: Pink Noise (or 1/f noise) is Constant-Q Noise (useful for adjusting
the EQ sections)]"));
imp_group(x) = revin_group(hgroup("[2] Impulse Selection",x));
pulseL = imp_group(button("[1] Left
[tooltip: Send impulse into LEFT channel]")) : ba.impulsify;
pulseC = imp_group(button("[2] Center
[tooltip: Send impulse into LEFT and RIGHT channels]")) : ba.impulsify;
pulseR = imp_group(button("[3] Right
[tooltip: Send impulse into RIGHT channel]")) : ba.impulsify;
inx = x*mutegain + (pulseL+pulseC) + pn;
iny = y*mutegain + (pulseR+pulseC) + pn;
pn = 0.1*pinkin*no.pink_noise;
};
};
//-------------------------`(dm.)fdnrev0_demo`---------------------------
// A reverb application using `fdnrev0`.
//
// #### Usage
//
// ```
// _,_,_,_ : fdnrev0_demo(N,NB,BBSO) : _,_
// ```
//
// Where:
//
// * `N`: feedback Delay Network (FDN) order / number of delay lines used =
// order of feedback matrix / 2, 4, 8, or 16 [extend primes array below for
// 32, 64, ...]
// * `NB`: number of frequency bands / Number of (nearly) independent T60 controls
// / Integer 3 or greater
// * `BBSO` : butterworth band-split order / order of lowpass/highpass bandsplit
// used at each crossover freq / odd positive integer
//------------------------------------------------------------
declare fdnrev0_demo author "Julius O. Smith III";
declare fdnrev0_demo licence "MIT";
fdnrev0_demo(N,NB,BBSO) = stereo_reverb_tester(revin_group)
<: re.fdnrev0(MAXDELAY,delays,BBSO,freqs,durs,loopgainmax,nonl)
:> *(gain),*(gain)
with{
MAXDELAY = 8192; // sync w delays and prime_power_delays above
defdurs = (8.4,6.5,5.0,3.8,2.7); // NB default durations (sec)
deffreqs = (500,1000,2000,4000); // NB-1 default crossover frequencies (Hz)
deflens = (56.3,63.0); // 2 default min and max path lengths
fdn_group(x) = vgroup("FEEDBACK DELAY NETWORK (FDN) REVERBERATOR, ORDER 16
[tooltip: See Faust's reverbs.lib for documentation and references]", x);
freq_group(x) = fdn_group(vgroup("[1] Band Crossover Frequencies", x));
t60_group(x) = fdn_group(hgroup("[2] Band Decay Times (T60)", x));
path_group(x) = fdn_group(vgroup("[3] Room Dimensions", x));
revin_group(x) = fdn_group(hgroup("[4] Input Controls", x));
nonl_group(x) = revin_group(vgroup("[4] Nonlinearity",x));
quench_group(x) = revin_group(vgroup("[3] Reverb State",x));
nonl = nonl_group(hslider("[style:knob] [tooltip: nonlinear mode coupling]",
0, -0.999, 0.999, 0.001));
loopgainmax = 1.0-0.5*quench_group(button("[1] Quench
[tooltip: Hold down 'Quench' to clear the reverberator]"));
pathmin = path_group(hslider("[1] min acoustic ray length [unit:m] [scale:log]
[tooltip: This length (in meters) determines the shortest delay-line used in the FDN
reverberator. Think of it as the shortest wall-to-wall separation in the room.]",
46, 0.1, 63, 0.1));
pathmax = path_group(hslider("[2] max acoustic ray length [unit:m] [scale:log]
[tooltip: This length (in meters) determines the longest delay-line used in the
FDN reverberator. Think of it as the largest wall-to-wall separation in the room.]",
63, 0.1, 63, 0.1));
durvals(i) = t60_group(vslider("[%i] %i [unit:s] [scale:log][tooltip: T60 is the 60dB
decay-time in seconds. For concert halls, an overall reverberation time (T60) near
1.9 seconds is typical [Beranek 2004]. Here we may set T60 independently in each
frequency band. In real rooms, higher frequency bands generally decay faster due
to absorption and scattering.]",ba.take(i+1,defdurs), 0.1, 100, 0.1));
durs = par(i,NB,durvals(NB-1-i));
freqvals(i) = freq_group(hslider("[%i] Band %i upper edge in Hz [unit:Hz] [scale:log]
[tooltip: Each delay-line signal is split into frequency-bands for separate
decay-time control in each band]",ba.take(i+1,deffreqs), 100, 10000, 1));
freqs = par(i,NB-1,freqvals(i));
delays = de.prime_power_delays(N,pathmin,pathmax);
gain = hslider("[3] Output Level (dB) [unit:dB][tooltip: Output scale factor]",
-40, -70, 20, 0.1) : ba.db2linear;
// (can cause infinite loop:) with { db2linear(x) = pow(10, x/20.0); };
};
//---------------------------`(dm.)zita_rev_fdn_demo`------------------------------
// Reverb demo application based on `zita_rev_fdn`.
//
// #### Usage
//
// ```
// si.bus(8) : zita_rev_fdn_demo : si.bus(8)
// ```
//------------------------------------------------------------
declare zita_rev_fdn_demo author "Julius O. Smith III";
declare zita_rev_fdn_demo licence "MIT";
zita_rev_fdn_demo = re.zita_rev_fdn(f1,f2,t60dc,t60m,fsmax)
with{
fsmax = 48000.0;
fdn_group(x) = hgroup("Zita_Rev Internal FDN Reverb [tooltip: ~ Zita_Rev's internal
8x8 Feedback Delay Network (FDN) & Schroeder allpass-comb reverberator. See
Faust's reverbs.lib for documentation and references]",x);
t60dc = fdn_group(vslider("[1] Low RT60 [unit:s] [style:knob][style:knob]
[tooltip: T60 = time (in seconds) to decay 60dB in low-frequency band]",
3, 1, 8, 0.1));
f1 = fdn_group(vslider("[2] LF X [unit:Hz] [style:knob] [scale:log]
[tooltip: Crossover frequency (Hz) separating low and middle frequencies]",
200, 50, 1000, 1));
t60m = fdn_group(vslider("[3] Mid RT60 [unit:s] [style:knob] [scale:log]
[tooltip: T60 = time (in seconds) to decay 60dB in middle band]",
2, 1, 8, 0.1));
f2 = fdn_group(vslider("[4] HF Damping [unit:Hz] [style:knob] [scale:log]
[tooltip: Frequency (Hz) at which the high-frequency T60 is half the middle-band's T60]",
6000, 1500, 0.49*fsmax, 1));
};
//---------------------------`(dm.)zita_light`------------------------------
// Light version of `dm.zita_rev1` with only 2 UI elements.
//
// #### Usage
//
// ```
// _,_ : zita_light : _,_
// ```
//------------------------------------------------------------
declare zita_light author "Julius O. Smith III";
declare zita_light licence "MIT";
zita_light = hgroup("Zita Light",(_,_ <: re.zita_rev1_stereo(rdel,f1,f2,t60dc,t60m,fsmax),_,_ :
out_eq,_,_ : dry_wet : out_level))
with{
fsmax = 48000.0; // highest sampling rate that will be used
rdel = 60;
f1 = 200;
t60dc = 3;
t60m = 2;
f2 = 6000;
out_eq = pareq_stereo(eq1f,eq1l,eq1q) : pareq_stereo(eq2f,eq2l,eq2q);
pareq_stereo(eqf,eql,Q) = fi.peak_eq_rm(eql,eqf,tpbt), fi.peak_eq_rm(eql,eqf,tpbt)
with {
tpbt = wcT/sqrt(max(0,g)); // tan(PI*B/SR), B bw in Hz (Q^2 ~ g/4)
wcT = 2*ma.PI*eqf/ma.SR; // peak frequency in rad/sample
g = ba.db2linear(eql); // peak gain
};
eq1f = 315;
eq1l = 0;
eq1q = 3;
eq2f = 1500;
eq2l = 0;
eq2q = 3;
dry_wet(x,y) = *(wet) + dry*x, *(wet) + dry*y
with {
wet = 0.5*(drywet+1.0);
dry = 1.0-wet;
};
drywet = vslider("[1] Wet/Dry Mix [style:knob] [tooltip: Ratio of dry and wet signal. -1 = fully wet, +1 = fully dry]",
0,-1.0,1.0,0.01) : si.smoo;
gain = vslider("[2] Level [unit:dB] [style:knob] [tooltip: Output scale
factor]", -6, -70, 40, 0.1) : ba.db2linear : si.smoo;
out_level = *(gain),*(gain);
};
//----------------------------------`(dm.)zita_rev1`------------------------------
// Example GUI for `zita_rev1_stereo` (mostly following the Linux `zita-rev1` GUI).
//
// Only the dry/wet and output level parameters are "dezippered" here. If
// parameters are to be varied in real time, use `smooth(0.999)` or the like
// in the same way.
//
// #### Usage
//
// ```
// _,_ : zita_rev1 : _,_
// ```
//
// #### Reference
//
// <http://www.kokkinizita.net/linuxaudio/zita-rev1-doc/quickguide.html>
//------------------------------------------------------------
declare zita_rev1 author "Julius O. Smith III";
declare zita_rev1 licence "MIT";
zita_rev1 = _,_ <: re.zita_rev1_stereo(rdel,f1,f2,t60dc,t60m,fsmax),_,_ : out_eq,_,_ :
dry_wet : out_level
with{
fsmax = 48000.0; // highest sampling rate that will be used
fdn_group(x) = hgroup(
"[0] Zita_Rev1 [tooltip: ~ ZITA REV1 FEEDBACK DELAY NETWORK (FDN) & SCHROEDER
ALLPASS-COMB REVERBERATOR (8x8). See Faust's reverbs.lib for documentation and
references]", x);
in_group(x) = fdn_group(hgroup("[1] Input", x));
rdel = in_group(vslider("[1] In Delay [unit:ms] [style:knob] [tooltip: Delay in ms
before reverberation begins]",60,20,100,1));
freq_group(x) = fdn_group(hgroup("[2] Decay Times in Bands (see tooltips)", x));
f1 = freq_group(vslider("[1] LF X [unit:Hz] [style:knob] [scale:log] [tooltip:
Crossover frequency (Hz) separating low and middle frequencies]", 200, 50, 1000, 1));
t60dc = freq_group(vslider("[2] Low RT60 [unit:s] [style:knob] [scale:log]
[style:knob] [tooltip: T60 = time (in seconds) to decay 60dB in low-frequency band]",
3, 1, 8, 0.1));
t60m = freq_group(vslider("[3] Mid RT60 [unit:s] [style:knob] [scale:log] [tooltip:
T60 = time (in seconds) to decay 60dB in middle band]",2, 1, 8, 0.1));
f2 = freq_group(vslider("[4] HF Damping [unit:Hz] [style:knob] [scale:log]
[tooltip: Frequency (Hz) at which the high-frequency T60 is half the middle-band's T60]",
6000, 1500, 0.49*fsmax, 1));
out_eq = pareq_stereo(eq1f,eq1l,eq1q) : pareq_stereo(eq2f,eq2l,eq2q);
// Zolzer style peaking eq (not used in zita-rev1) (filters.lib):
// pareq_stereo(eqf,eql,Q) = peak_eq(eql,eqf,eqf/Q), peak_eq(eql,eqf,eqf/Q);
// Regalia-Mitra peaking eq with "Q" hard-wired near sqrt(g)/2 (filters.lib):
pareq_stereo(eqf,eql,Q) = fi.peak_eq_rm(eql,eqf,tpbt), fi.peak_eq_rm(eql,eqf,tpbt)
with {
tpbt = wcT/sqrt(max(0,g)); // tan(PI*B/SR), B bw in Hz (Q^2 ~ g/4)
wcT = 2*ma.PI*eqf/ma.SR; // peak frequency in rad/sample
g = ba.db2linear(eql); // peak gain
};
eq1_group(x) = fdn_group(hgroup("[3] RM Peaking Equalizer 1", x));
eq1f = eq1_group(vslider("[1] Eq1 Freq [unit:Hz] [style:knob] [scale:log] [tooltip:
Center-frequency of second-order Regalia-Mitra peaking equalizer section 1]",
315, 40, 2500, 1));
eq1l = eq1_group(vslider("[2] Eq1 Level [unit:dB] [style:knob] [tooltip: Peak level
in dB of second-order Regalia-Mitra peaking equalizer section 1]", 0, -15, 15, 0.1));
eq1q = eq1_group(vslider("[3] Eq1 Q [style:knob] [tooltip: Q = centerFrequency/bandwidth
of second-order peaking equalizer section 1]", 3, 0.1, 10, 0.1));
eq2_group(x) = fdn_group(hgroup("[4] RM Peaking Equalizer 2", x));
eq2f = eq2_group(vslider("[1] Eq2 Freq [unit:Hz] [style:knob] [scale:log] [tooltip:
Center-frequency of second-order Regalia-Mitra peaking equalizer section 2]",
1500, 160, 10000, 1));
eq2l = eq2_group(vslider("[2] Eq2 Level [unit:dB] [style:knob] [tooltip: Peak level
in dB of second-order Regalia-Mitra peaking equalizer section 2]", 0, -15, 15, 0.1));
eq2q = eq2_group(vslider("[3] Eq2 Q [style:knob] [tooltip: Q = centerFrequency/bandwidth
of second-order peaking equalizer section 2]", 3, 0.1, 10, 0.1));
out_group(x) = fdn_group(hgroup("[5] Output", x));
dry_wet(x,y) = *(wet) + dry*x, *(wet) + dry*y with {
wet = 0.5*(drywet+1.0);
dry = 1.0-wet;
};
drywet = out_group(vslider("[1] Wet/Dry Mix [style:knob] [tooltip: Ratio of dry and wet signal. -1 = fully wet, +1 = fully dry]",
0, -1.0, 1.0, 0.01)) : si.smoo;
out_level = *(gain),*(gain);
gain = out_group(vslider("[2] Level [unit:dB] [style:knob] [tooltip: Output scale
factor]", -20, -70, 40, 0.1)) : ba.db2linear : si.smoo;
};
//----------------------------------`(dm.)vital_rev_demo`------------------------------
// Example GUI for `vital_rev` with all parameters exposed.
//
// #### Usage
//
// ```
// _,_ : vital_rev_demo : _,_
// ```
//
//------------------------------------------------------------
vital_rev_demo = hgroup("Reverb", re.vital_rev(prelow, prehigh, lowcutoff, highcutoff, lowgain, highgain, chorus_amt, chorus_freq, predelay, time, size, mix))
with {
// SMOO = _;
SMOO = si.smoo; // optionally turn on smoo of hsliders
Prefilter(x) = hgroup("[0] Pre-filter", x:SMOO);
Filter(x) = hgroup("[1] Filter", x:SMOO);
Chorus(x) = hgroup("[2] Chorus", x:SMOO);
Space(x) = hgroup("[3] Space", x:SMOO);
prelow = Prefilter(hslider("[0] Low Cutoff [style:knob]", it.remap(16,135,0,1,16), 0, 1, .01));
prehigh = Prefilter(hslider("[1] High Cutoff [style:knob]", it.remap(16,135,0,1,110), 0, 1, .01));
lowcutoff = Filter(hslider("[0] Low Shelf [style:knob]", it.remap(16,135,0,1,16), 0, 1, .01));
highcutoff = Filter(hslider("[2] High Shelf [style:knob]", it.remap(16,135,0,1,90), 0, 1, .01));
lowgain = Filter(hslider("[1] Low Gain [style:knob]", it.remap(-6,0,0,1,0), 0, 1, .01));
highgain = Filter(hslider("[3] High Gain [style:knob]", it.remap(-6,0,0,1,-1), 0, 1, .01));
chorus_amt = Chorus(hslider("[0] Amount [style:knob]", .01, 0, 1, .01));
chorus_freq = Chorus(hslider("[1] Rate [style:knob]", 0.1, 0, 1, .01));
predelay = Space(hslider("[0] Pre-Delay [style:knob]", 0, 0, 1, .01));
time = Space(hslider("[1] Decay Time [style:knob]", 0.5, 0, 1, .01));
size = Space(hslider("[2] Size [style:knob]", .5, 0, 1, .01)) : aa.clip(0, 1);
mix = hslider("[4] Mix [style:knob]", 1, 0, 1, .01) : SMOO : aa.clip(0, 1);
};
declare vital_rev_demo author "David Braun";
declare vital_rev_demo license "GPL-3.0";
//--------------------------`(dm.)reverbTank_demo`---------------------------
//
// This is a stereo reverb following the "ReverbTank" example in [1],
// although some parameter ranges and scaling have been adjusted.
// It is an unofficial version of the Spin Semiconductor® Reverb.
// Other relevant instructional material can be found in [2-4].
//
// #### Usage
// ```
// _,_ : reverbTank_demo : _,_
// ```
//
// #### References
// * [1] Pirkle, W. C. (2019). Designing audio effect plugins in C++ (2nd ed.). Chapter 17.14.
//
// * [2] Spin Semiconductor. (n.d.). Reverberation. Retrieved 2024-04-16, from <http://www.spinsemi.com/knowledge_base/effects.html#Reverberation>
//
// * [3] Zölzer, U. (2022). Digital audio signal processing (3rd ed.). Chapter 7, Figure 7.39.
//
// * [4] Valhalla DSP. (2010, August 25). RIP Keith Barr. Retrieved 2024-04-16, from <https://valhalladsp.com/2010/08/25/rip-keith-barr/>
//-----------------------------------------------------------------------
reverbTank_demo = hgroup("Reverb", ef.dryWetMixer(wet,
(preDelay : preFilter : avg : ((si.bus(2) :> branches) ~ selectLastBranchDelay) : selectLR :> shelves)
))
with {
/*
All-capitalized signals are compile-time constant.
All other signals can be modulated in real-time, although you may not necessarily want to modulate them.
*/
// SMOO = _; // If you don't want to smooth parameters.