Left stick to control frequency.
Right stick to control decay.
Press the left stick like a button to freeze the current frequency value.
Press the right stick like a button to freeze the current delay value.
LB and RB to control Attack.
Press A (or X if using Playstation) to change wavetype.
When recording a waveform, use the left stick to control the real (cosine)(horizontal) and imaginary(sine)(vertical) waves.