Sequential Prophet X - Appendix D: Troubleshooting and Support; Troubleshooting

136 137Appendix D: Troubleshooting and Support
Sequential Prophet X 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 X, here are a few typical scenarios and their solutions:
If the Prophet X isn’t producing sound:.
1. Recall the Basic Program by holding the Transpose down button and
pressing the hold button.
2. If the problem is still there, check the following:
• 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 X
is set to master or off. Or if set to slave or slave thru or slave no s/s,
make sure the Prophet X 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 X is set to master or off. Or
if set to slave or slave thru or slave no s/s, make sure the Prophet X 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 X. Or use MIDI, which is opto-
isolated.
If the Prophet X is behaving erratically.
• This is almost always caused by a MIDI feedback loop. Make sure that
any MIDI Thru functionality is turned off on the MIDI interface/hard-
ware or in the MIDI software application. Disconnect all the Prophet
X’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 X is being
overrun with duplicate messages.
If the Prophet X 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 X plays out of tune:
• Check the master coarse and master fine parameter in the global
menu to make sure they are both set to 0.
If the pitch or mod wheel doesn’t go to full range:
• Recalibrate the pitch and mod wheels. See “Calibrating the Prophet X”
on page 117.
If the touch sliders don’t go to full range:
• Recalibrate the touch sliders. See “Calibrating the Prophet X” on page
117.
If the lter sounds strange or out of tune:
• You may need to retune the lters. See “Calibrating the Prophet X” on
page 117.