About the Sync Modes

The sync modes determine how the LFO cycle affects the notes you play.

Part: In this mode, the LFO cycle is free running and affects all the voices in sync. Free running means that the LFO cycles continuously, and does not reset when a note is played.
MIDI: In this mode, the LFO rate is synced in various beat increments to MIDI clock.
Voice: In this mode, each voice in the Part has its own independent LFO cycle (the LFO is polyphonic). These cycles are also free running – each key down starts anywhere in the LFO cycle phase.
Key: Same as Voice except that it is not free running – for each key down the LFO cycle starts over.