Dave Smith Instruments PROPHET 12 DESKTOP - Manual (Page 99)

87 Prophet 12 Module Operation Manual Appendix E: Support
Appendix E: Support
Troubleshooting
Here are a few suggestions for resolving problems that may occur.
The arpeggiator has stopped running.
Check the Clock settings in the Global menu to ensure the Prophet 12 is set to
Master or, if set to Slave, make sure the Prophet 12 is receiving MIDI clock.
Some of the programs sound different than before.
Check the Mod Wheel position on your controller keyboard. The Mod Wheel can
do a lot more than just add vibrato. Also, check the Clock settings in the Global
menu to ensure the Prophet 12 is set to Master or, if set to Slave, make sure the
Prophet 12 is receiving MIDI clock.
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 12. Or use MIDI, which is opto-isolated.
The Prophet 12 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 (sequencer or whatever). Disconnect all the Prophet 12’s
MIDI connections—MIDI and USB cables—and see if the problem persists. You
can also monitor the MIDI traffic with MIDI Monitor (Mac OS) or MIDI-OX
(Windows) to see if the Prophet 12 is being overrun with duplicate messages.
Two voices play with each keystroke.
There may be a MIDI loop. Unplug the MIDI and/or USB cables and see if the
problem persists. This is generally caused by MIDI Thru functionality in either
the MIDI interface/hardware or in a MIDI software application.
The Prophet 12 doesn’t seem to respond to its controls.
If the synth seems to be responding normally, but doesn’t make sound, make sure
Local Control is on in the Global menu.
MIDI System Exclusive data is not be transmitted/received.
Check the SysEx settings in the Global menu.