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Sound levels are very much a matter of personal taste (especially if you are going deaf
like we are), and what sounds great in one layout environment may sound too loud or
too soft in another. Fortunately all sound levels can be easily adjusted to best suit your
own requirements and we recommend that you experiment with different settings if you
don’t care for the default levels.
To set the volume levels go into the program mode on your DCC system (refer to your
system’s manual for instructions on how to do this as each system is slightly different);
enter the desired CV number; then enter the desired levels. Note that this can be done
either on a programming track or on the main (ops mode) if your DCC system supports
programming on the main.
We strongly recommend that you keep notes on which settings you have changed and
which values were used. If you ever need to do a reset on the decoder (see “Factory
Reset” below) then having good notes will allow you to easily re-enter any changes that
you might want to keep.
VERY IMPORTANT: Before you change any of the volume control CVs,
please make sure that CV 32 is set to 1. CV 32 is used as an index selec-
tion register and if you don’t set it first then we are not responsible for
your resulting rage and the fact that you will probably throw the loco-
motive against the wall in frustration.
REBUILT GMD-1 SOUND VOLUME SETTINGS
FUNCTION
CV
DEFAULT
RANGE
YOUR VALUE
MASTER VOLUME
63
192
0-192
DIESEL VOLUME
259
128
0-128
HORN VOLUME
275
128
0-128
BELL VOLUME
283
50
0-128
SLOW DOPPLER VOLUME
427
128
0-128
FAST DOPPLER VOLUME
339
128
0-128
FAST SARCO VALVE VOLUME
371
80
0-128
SLOW SARCO VALVE VOLUME
387
80
0-128
CURVE SQUEAL VOLUME
403
128
0-128
FACTORY RESET
On your GMD-1, you perform a factory reset by entering a value of “8” into CV 8. Note
that this will cause all of your new volume and motor settings to be lost, so you will need
to reprogram any settings that you want to keep. You did keep notes like we suggested
earlier, didn’t you?
You can NOT lose all of the pre-recorded sounds on your GMD-1 decoder by doing a
