The WAVE button selects one of the LFO waveforms, step modulator, X modulators, or envelope follower.
Holding the WAVE button enables envelope triggered (one shot) mode for each modulation type.
The envelope LED will blink green when it is triggered.
Triangle and square waves play one cycle with the RATE knob controlling their length. The random modes and step modulator produce a new value on each note. The X mod waveforms will sweep once on each note.
See RATE or AMOUNT for more detail on each modulation type.