Sequential Prophet Rev 2 - Appendix D: Troubleshooting and Support; Troubleshooting

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79Appendix D: Troubleshooting and Support
Sequential Prophet Rev2 User’s Guide
Appendix D: Troubleshooting and Support
Appendix D: Troubleshooting
and Support
Troubleshooting
If you’re experiencing problems or unexpected behavior from your
Prophet Rev2, here are a few typical scenarios and their solutions:
If the Prophet Rev2 isn’t producing sound:.
1. Initialize a basic preset by holding the Transpose down and up buttons
and pressing the hold button.
2. If the problem is still there, check the following:
• Master Volume - make sure it is set to an appropriate value
• Rear-panel output jacks - make your audio cables are connected to main/a
output.
• In the global menu, make sure that local control is set to on.
If the sequencer or arpeggiator has stopped running:
• Check the midi clock mode setting in global to ensure the Prophet
Rev2 is set to master or off. Or if set to slave or slave thru or slave
no s/s, make sure the Prophet Rev2 is receiving MIDI clock.
If some of the programs sound different than usual:
• In the Global menu, check alt tunings and make sure it’s set to equal
temperament. Also, check the mod wheel position. The mod wheel can
do more than just add vibrato. Also, check the midi clock mode setting
in the global menu to ensure the Prophet Rev2 is set to master or off.
Or if set to slave or slave thru or slave no s/s, make sure the Prophet
Rev2 is receiving MIDI clock.
If there is a ground hum in the audio output:
• USB can cause ground loops, so try to resolve any grounding issues
between the computer and the Prophet Rev2. Or use MIDI, which is opto-
isolated.
If the Prophet Rev2 is behaving erratically.
• This is almost always caused by a MIDI data loop. Make sure that any
MIDI Thru functionality is turned off on the MIDI interface/hardware
or in the MIDI software application. Disconnect all the Prophet Rev2’s
MIDI connections—MIDI and USB cables—and see if the problem
persists. You can also monitor the MIDI trafc with MIDI Monitor
(Mac OS) or MIDI-OX (Windows) to see if the Prophet Rev2 is being
overrun with duplicate messages.
If the Prophet Rev2 doesn’t seem to respond to its controls:
• Make sure local control is on in the global menu.
If MIDI System Exclusive data is not transmitted/received:
• Make sure that the midi sysex cable setting in the global menu is set
to usb or midi depending on which you are using to transmit or receive
MIDI messages.
If the Prophet Rev2 plays out of tune:
• Check the master coarse and master fine parameter in the global
menu. If they seem correct, you may need to retune the oscillators. See
“Calibrating the Oscillators and Filters” on page 69.
If the pitch or mod wheel doesn’t go to full range:
• Recalibrate the pitch and mod wheels. See “Calibrating the Pitch and
Mod Wheels” on page 69.
If the lter sounds strange or out of tune:
• You may need to retune the lters. See “Calibrating the Oscillators and
Filters” on page 69.