Inc Sound Module Decoder - Manual
© 2017 Digitrax, Inc.
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waves that are “out of phase”. This minimizes sound cancellation, particularly
at lower frequencies. For best sound generation, the cubic volume of the bafe
should be as large as possible and the bafe walls should be acoustically rigid to
prevent acoustic interference.
Practical bafe materials are plastic, cardboard and sheet metal. Common items
such as cardboard tubes, soda caps, or 35mm lm canisters can be modied to
create reasonable bafes in the available space inside your locomotive. Most
N and HO scale locomotives have limited internal volume inside the shell,
requiring ingenuity to get best sound performance out of the limited space avail-
able.
11.1.2 Sound Hold Up Capacitor or Power Xtender?
All series Digitrax SoundFX decoders have an electrolytic capacitor either
wired to the harness or provided separately in the package. Installation of this
cap is necessary for reliable operation. However, it will keep the sound alive in
the presence of short power interruptions.
If you are using a series 6 sound decoder and you have problems with power in-
terruptions that interfere with the operation of your locomotives and the sound,
you may want to consider using a PX power extender module. Power Xtenders
are engineered to provide additional power storage capacity to allow locos to
continue running and producing sound even when electrical signal is lost for a
short amount of time.
11.2 Programming SoundFX Decoders
Your Digitrax SoundFX decoder is ready to run and will operate and generate
sound using address 03 with no additional programming. See the instruction
sheet that came with your decoder for information about the default sound
scheme and other sound schemes that may be available in the decoder.
On your Digitrax system, simply select the locomotive’s address and the sound
will start. On some other DCC systems, it may be necessary to select the loco-
motive address AND send a command to start the sounds.
For a more prototypical railroading experience, your decoder can be customized
for your specic locomotive by programming various Conguration Variables.
Digitrax sound decoders use the same CVs as non-sound decoders for control-
ling everything except sound. Digitrax sound decoders can be programmed us-
ing either a programming track or with the operations mode using the main line.
Before changing any CVs, it is useful to run it on the factory default address 03
to check the installation. The following sections detail CVs commonly used in
Digitrax Sound Decoders.