SoundTraxx LC Series Owners Manual User Manual
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LC SERIES DIGITAL SOUND DECODER OWNER’S MANUAL
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CV 120, Whistle/Horn Volume
CV 120 can be set to any value between 0 and 255, with the minimum volume being 0 (sound is
off) and the maximum is 255. The default is 192 or 75% volume.
Airpump Settings (Steam Only)
The DSD-LC provides two CVs for setting the
airpump effect:
CV 112, Airpump Sound Effect Enable
CV 112 is used to enable the automatic sounds
of the airpump. Additionally, it is used to select
whether to use a conventional exhaust chuff
or that of an articulated steam engine. Refer to
Table H for the correct CV value.
CV 123, Airpump Volume
CV 123 can be set to any value between 0 and
255, with the minimum volume being 0 (sound
is off) and the maximum is 255. The default is
128 or 50% volume.
Dynamic Brake Settings (Diesel Only)
The DSD-LC provides one CV for setting the dynamic brake effect:
CV 123, Dynamic Brake Volume
CV 123 can be set to any value between 0 and 255, with the minimum volume being 0 (sound is
off) and the maximum is 255. The default is 128 or 50% volume.
Steam Exhaust Settings
The DSD-LC provides three CVs for setting the Steam Exhaust Chuff sound effect:
CV 112, Exhaust Cadence Selection
CV 112 is used to select a conventional or articulated exhaust chuff cadence. It is also used to
enable the airpump sounds. Refer to Table H for the correct value to use for this CV.
CV116, Auto Exhaust Chuff Rate
The DSD-LC uses Auto-Exhaust synchronization that automatically generates an exhaust chuff
rate proportional to the throttle setting. Since every locomotive is different, CV 116 is used to
match up the Auto Exhaust rate to the locomotive speed and may be loaded with any value be-
tween 0 and 127. Higher values will yield higher chuff rates for a given throttle setting. A typical
synchronization rate may be computed as:
SPD
CV Value = 115.9 X ——— X Gear Ratio
DIA
where SPD is the locomotive’s top speed in scale miles-per-hour at full throttle and DIA is the
locomotive’s driver wheel diameter in scale inches, and Gear Ratio is the gear ratio for shays
and other geared engines. For conventional steam engines, use a Gear Ratio = 1. The driver
diameter can be easily measured with a scale ruler but remember to convert the measurement
to scale inches.
If you don’t know your locomotive’s top speed, you can also estimate it and still get pretty good
results. A good rule of thumb is to use 45 MPH for freight locomotives and 70 MPH for passen-
ger engines.
Off
On
Off
On
Airpump Exhaust Chuff
Conventional
Conventional
Articulated
Articulated
CV Value
0
1
128
129
Table H. CV 112, Airpump Selection