Korg modwave native Manual page 73

LFOs
Sync Notes
[Off, On]
Off: The LFO starts each time you press a key, and an independent LFO runs for each note. This is the default.
On: The LFO starts from the phase determined by the first note in the phrase, so that the LFOs for all notes being held
are synchronized together. Fade applies only to the first note in the phrase.
Note: Even if Sync Notes is On, each note's LFO speed may still be different if modulated by note number, velocity, key
scaling, or other note-specific modulation sources.
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