SoundTraxx Tsunami Steam Users Guide - Manual (Page 48)

Tsunami Steam Sound User’s Guide Page 45
Articulated Mode
Tsunami provides an auto-exhaust mode to simulate the cadence of a
simple* articulated locomotives. When this mode is enabled, the exhaust
sound will have chuff-chuff-pause rhythm simulating two cylinder sets that
are out of sync with each other. You can also set a variable wheel slip rate
that causes the two sets of exhaust chuffs to go in and out of sync with each
other as if one set of drivers were continuously slipping**. It is also useful for
generating a double-header sound effect, especially if the second engine is
not equipped with a sound system.
Once you have determined which Exhaust Mode you want, use Table L to
find the proper value to program into CV 112. Note that you will also have to
decide on how many airpumps to set (see next section) before finalizing a
value for this CV.
*Compound articulated engines recycled the steam from one cylinder set, the
high-pressure side, into the second cylinder set, the low-pressure side, and thus
produce the same exhaust cadence as a simple two-cylinder engine. You can readily
identify a compound type engine by the observing that the low-pressure cylinder are
substantially larger in diameter than the high-pressure cylinders.
**Technically, this did not likely occur often in prototype practice except perhaps when
a train was first started as it would result in rapid wear of the slipping drive wheels but
it does make for an interesting sound effect.
CV 116, Auto Exhaust Rate
CV 116 is used to adjust the exhaust chuff rate when using Auto-Exhaust
synchronization. Auto-Exhaust 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
Exhaust Mode
Conventional Rod Engine
Conventional Rod Engine
Articulated Engine
Articulated Engine
Articulated Engine
Articulated Engine
Articulated Engine
Articulated Engine
Articulated Engine
Articulated Engine
Cam Synchronized
Cam Synchronized
Wheel Slip Rate
None
None
None
None
Slow
Slow
Medium
Medium
Fast
Fast
None
None
Airpump
Single Airpump
Dual Airpump
Single Airpump
Dual Airpump
Single Airpump
Dual Airpump
Single Airpump
Dual Airpump
Single Airpump
Dual Airpump
Single Airpump
Dual Airpump
CV Value
0
1
64
65
80
81
96
97
112
113
128
129
Table L. CV 112, Exhaust Mode and Airpump Selection
Sound Programming