[Suggestion] Standalone app and QOL

[Tremeschin]

Hey, haven't saw any updates lately on this repo as it's really not much else to do but dunno, might be worth a try suggesting a few things in one issue.

As I couldn't find any better audio spectrogram than this one because the colors and information I can see from it are nicer than the competition, is there any possibility of making this a standalone app potentially compatible with Jack Audio for real time visualizations of audio outputs as that'd help me a lot in sound designing and production.

I have a couple quality of life suggestions, here goes a little list (don't feel creating another issue track just for them as I said in the first sentence of this post):

• When hovering the mouse in a frequency, show its value in Hz and the nearest piano note on the chromatic scale. Just like Sonic Visualizer does, that helps a lot in getting melodies and chords from musics, but that app isn't real time, however your spectogram looks a lot more easy to make it "real-time-able"~ish.

• Change the total number of FFTs being applied (and add a minimum threshold / max threshold for the colors?)

• More transformations on the low frequencies; don't get me wrong, the default resolution is really nice but maybe some more information on the bass would help a little more as their frequencies are not that far apart because exponential shenanigans.

Welp, anyways, thanks for the app, it's really fun to visualize the audio you're listening to, hearing new things you never noticed and learning from music to produce better.