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Added Multichannel-to-equave feature to support Lumatone and other multichannel many-note controllers #642

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Added options in the MIDI tab to select multichannel mode, center channel (1-16), number of equaves (1-16), and equaves down (0-15). Added multichannel index offset calculation using mmod and user-selected parameters. If the index goes outside the 0-127 range, frequency is calculated directly using scale.getFrequency().
TODO: automatically select all channels when toggling multichannel mode.

package.json Outdated
@@ -28,7 +28,7 @@
"vue-router": "^4.3.0",
"webmidi": "^3.1.8",
"xen-dev-utils": "^0.2.9",
"xen-midi": "^0.1.3"
"xen-midi": "github:xenharmonic-devs/xen-midi"
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Is xen-midi good enough now? I should publish current main then.

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It is fine for multichannel use, please publish! I was thinking of adding another export MidiOutMTS which would give an alternative to multichannel PB using Midi Tuning Standard and sysex (opt in popup for browser users): The logic of retuning in Midi 2.0 is almost identical so the code will be re-useable when sw adds Midi 2.0 compatibility (roadmap 4.0???) Concept is to use the note numbers as slots in which the "actual" neareast MIDInote and needed PB are stored. Then one can simply cycle through the MIDI note slots and recover info from them for per-note stuff (NoteOff Velocity, Poly AT etc.)

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Published. Please update to "xen-midi": "^0.2.0"

Please raise a dedicated issue in xen-midi about this MIDI 2.0 stuff, so your ideas won't get lost once this PR is closed.

src/App.vue Outdated Show resolved Hide resolved
@@ -139,6 +139,7 @@ ul.btn-group {
}
.control.checkbox-container {
flex-flow: unset;
gap: 0.15rem 1rem;
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This affects all checkboxes in the application. Did you make sure we want this accross the board?

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I did this because otherwise they cram together without spacing when placed side-by-side. It seems to look OK, what do you think?

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It's too wide for my taste to be applied across the app.
A more conservative gap would be a nice addition, though. Some of the labels elements have extra spaces in them which looks bad in template code.

Beyond the scope of this PR anyway. Please include the changes you need under <style scoped> in MidiView.vue.

@@ -149,6 +150,10 @@ ul.btn-group {
.control.radio-group span label {
font-weight: unset;
}
.control.select-group {
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"Select" is a particular HTML element. I don't see this being used with that tag. Try to find a synonym for this group type if possible.

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OK, will do.

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for now I replaced "select-group" with "dropdown-group" and also added "checkbox-group" to match the already existing "radio-group". Not sure but it seemed to make sense that a row of each of these HTML elements might need different spacing. Will move this to the new issue #644.

src/App.vue Outdated

// in multichannel-to-equave mode calculate an offset based on the incoming channel
if (midi.multichannelToEquave && channel !== undefined) {
let offset = mmod(channel - midi.multichannelCenter + midi.multichannelEquavesDown, midi.multichannelNumEquaves) - midi.multichannelEquavesDown
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const offset; index += offset * scale.scale.size; Might be nicer (prefer const over let when possible).

src/App.vue Outdated
if (rawAttack === undefined) {
rawAttack = 80
}
let frequency = scale.frequencies[index]

let frequency = scale.getFrequency[index]
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(index) instead of [index].

@@ -143,12 +143,19 @@ ul.btn-group {
.control.checkbox-container label {
font-weight: normal;
}
.control.checkbox-group {
flex-flow: unset;
gap: 0.15rem 1rem;
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We already discussed this. Don't modify global styles in this PR.

</span>
</div>
<label>Settings for multichannel-to-equave mode</label>
<div class="control dropdown-group">
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There's nothing dropdown about this group of elements. See btn-dropdown-group on what that means.

@frostburn
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The merge conflict needs to be resolved. Rebase on current main.

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Mapping compatible with Surge XT
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