update readme

README.md

@@ -15,17 +15,25 @@ This synthesizer isn't very good, but it's neat :3
 - [x] Create a widget for this smart-slider to clean up the ui code
 - [x] Add envelope generation, attach to global volume for now. ADSR and such,
       responds to note-on/note-off events
-- [ ] Make midi/keyboard control cross-platform. Use case will mostly be
+- [x] Make midi/keyboard control cross-platform. Use case will mostly be
       Midi -> linux and Keyboard -> windows though
 - [ ] Create oscillator class where the actual tone generation occurs. Multiple
       oscillators increase the sound complexity considerably
 - [x] Create a UI scope to visualize the synthesized composite waveform
 - [ ] Create wavetables for more complex tone generation. Needs to be selectable from ui
 - [x] Create digital filters, prob biquad. Controllable from ui obv (cutoff + resonance)
-- [ ] Add polyphony somewhere. Probably involves a voice class. If processing power
+- [x] Add polyphony somewhere. Probably involves a voice class. If processing power
       allows it, tie a voice to each midi note
-- [ ] Add noise ? 
+- [ ] polyphony is lacking sustain pedal rn
 - [ ] planning gets sparse this far out because its how far I got with the ESP32 synth
+- [ ] Filter upgrades including some more complex solving techniques (State Variable Filter),
+      better key tracking, more natural envelope curves, filter drive, etc.
+- [ ] Reverb (quite a few ways to do this, needs more research)
+- [ ] Pitch tuning with the multiple oscillators (Octave > Semitone > Fine-tune)
+- [ ] Frequency Modulation (huge)
+- [ ] Profile saving and loading, also includes loading configurations like keymaps, audio
+      engine config, etc. from a yaml instead of being hardcoded
+- [ ] Noise 
 
 ## setup
 TODO: instructions on build setup