Having written a minimal working version, here are features to add:

- DONE: Avoid redundant parameter changes.
- IN PROGRESS: Resizeable window.
- DONE: Button input:
    Parameter that increases or decreases on button hold.
    Emit midi note on button press.
    Ah: explicitly denote which parameters can be mapped to cursor buttons,
      hit the button while hovering over widget to 
- DONE: Input when not playing.
- Configurable MIDI output
    Clickable widgets inside plugin window but outside tablet extent.
    Button 1 starts MIDI note, button 2 holds it?
- Vocal synth
    Inhale on Z decrease
    Position to determine vowel quality
    Buttons for pitch
    Pressure for volume AND brightness
- Formant filter
- FM synth
- Granulator
    Load sample file into ring buffer
    X: grain start point
    Y: grain length
    P: grain amount, volume?
- Multi-touch? Pending hardware
- Shepard tone
    Left and right determines pitch increase rate
    Up and down determines brightness
- Pitch scale loader
    Quantize to nearest note from loaded scala file