Yamaha TG500 Owner's Manual page 240

UTILITY MODE / WAVE EDIT MODE / 3: MIDI
228
3-1: PARAMETER
Control change Control change
#0 Data
*
*
*: Control change message #32 with data values of 32 ~ 43, or 80 ~ 85
will only be responded to if the TG500 is in multi play mode.
This message will switch the voice or performance memory of the
receiving channel.
Play mode
#32 Data
Memory