Yamaha TG500 Owner's Manual page 149

VOICE EDIT MODE / 3: Full Edit. 3-5: LFO
Phase (LFO start phase)
Range: 0 ... 180
Determines at which point in the LFO waveform the LFO will begin opera-
tion for the selected element. The values 0 through 180 correspond to phase
angles in degrees. The illustration below shows how the various phase angles
correspond to points on the LFO waveform (a sine wave is used for clarity).
3-5-01: PARAMETER 137