Dave Smith Instruments PROPHET 12 KEYBOARD - Manual (Page 96)

86 Appendix E: Support Dave Smith Instruments
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. 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 is 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.
Make sure Show is not on. If the synth seems to be responding normally,
but doesn’t make sound, make sure Local Control is on in the Global
menu.