Add plan.txt

plan.txt

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+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
+