Yamaha VP-1 Owner's Manual page 157

The VP1 fails to change voices in response to received program-change data, or fails to transmit
program-change data to external devices.
Problems caused by Inappropriate voice settings
No sound
Keys don't produce the expected pitch.
Distorted sound
Improper stereo effect
• The "Program Change" parameter is probably set "off". Change the setting to "on".
• Be sure that you are operating in PLAY mode. Sending or receiving of program-
change data is available only in PLAY mode.
• Is the scene correctly set to produce sound?
• Is at least one element switched on?
• Are "MaxNotes" parameters set above 0?
• Are element "Volume" parameters set above 0?
• Are "Note Limit" parameters set correctly?
• Are OUTPUT/MIXER settings correct?
• Is an element's "Detune" parameter set to a value other than 0?
• Is an element's "NoteShift" parameter set to a value other than 0?
• Is an element's "Microtune" parameter set to a value other than "Equal"?
• Are you applying a Pitch Change effect?
• Have you assigned a pitch-bending parameter to any controller other than the Pitch
wheel?
• Note that the VP1 may occasionally produce incorrect pitch for notes in the
extremely high or low ranges.
• Layering of elements may sometimes produce distortion.
• Are you applying extreme equalization?
• Are "PanRngL" and "PanRngR" parameters set to -31 and +31, respectively?
• If you are using a feedback delay effect, check that the effect setting is appropriate.
Troubleshooting
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REFERENCE
Appendix
App - 7