WTR manual: The wave form can be drawn into the wave table by hand movements.. up and down. There are 4 modes that can be selected by pressing the button. mode 0: pot sets sample rate (high freq) ir records wavetable. mode 1: pot sets sample rate (low freq) ir records wavetable. mode 2: pot sets sample rate 2 octaves from C2, notes from keyboard. ir records wavetable. mode 3: pot controls filling of wavetable with random values. ir sets pitch 2 octaves from C2, notes from keyboard. It is possible to add a midi input to the wtr. with some extra circuitry. When you connect a midi keyboard and press a key the wtr will go into midi mode (uses mode 2). the button will toggle disable/enable the ir sensors recording (keeps or records waveform). the pot will set the arpeggio speed (there is no polyphony). keyboard values: C2 to C4 note values. C4# normal pitch D4. 1 octave up D4# 2 octave up E4. 3 octave up F4. arpeggio up F4# arpeggio down G4. arpeggio random