[tim-janik/beast] Blepsynth improvements (#143)

[Stefan Westerfeld <notifications github com>]

Here is a bunch of new stuff for BlepSynth, I won't try to reproduce the commit entries here. Only a few additional observations:

• x^3 non-linear adsr time scaling used to work but now it doesn't probably due to parameter API changes (I didn't try to fix it)
• some parameters (octave, unison voices) need step=1 but I haven't seen how to set it when registering a parameter, so this workarounded a bit by overriding param-to-text conversion and omitting decimals
• new filter envelope is hard-wired to modulate cutoff, whereas it would make sense if it could modulate any parameter, but we don't have the ui for selecting modulation targets yet (nor the infrastructure bits)

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You can view, comment on, or merge this pull request online at:

  https://github.com/tim-janik/beast/pull/143

Commit Summary

• DEVICES: blepsynth: copy remaining relevant files from bleposc branch
• DEVICES: blepsynth/blepsynth.cc: we have midi input, remove note toggles
• DEVICES: blepsynth: add smoothing for cutoff frequency, add drive property
• DEVICES: blepsynth: clean up old note toggles helper function
• DEVICES: blepsynth: display unison voice text as integer
• DEVICES: blepsynth: support osc octave + pitch properties
• DEVICES: blepsynth: add linear ADSR shape for Envelope
• DEVICES: blepsynth: add filter envlope and cutoff modulation
• DEVICES: blepsynth: smooth "Env Cutoff Modulation" to avoid clicks
• DEVICES: blepsynth: stop filter envelope at note off
• DEVICES: blepsynth: add filter key tracking

File Changes

• A devices/blepsynth/TODO (9)
• M devices/blepsynth/blepsynth.cc (176)
• A devices/blepsynth/bleputils.hh (47)
• A devices/blepsynth/designblep.cpp (365)
• A devices/blepsynth/linearsmooth.hh (60)
• A devices/blepsynth/plotblep.py (212)
• A devices/blepsynth/testblep.cpp (757)

Patch Links:

• https://github.com/tim-janik/beast/pull/143.patch
• https://github.com/tim-janik/beast/pull/143.diff

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