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Sound Programming

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.

Exhaust Mode

Wheel Slip Rate

Airpump

CV Value

Conventional Rod E

ngine

None

Single Airpump

0

Conventional Rod E

ngine

None

Dual Airpump

1

Articulated Engine

None

Single Airpump

64

Articulated Engine

None

Dual Airpump

65

Articulated Engine

Slow

Single Airpump

80

Articulated Engine

Slow

Dual Airpump

81

Articulated Engine

Medium

Single Airpump

96

Articulated Engine

Medium

Dual Airpump

97

Articulated Engine

Fast

Single Airpump

112

Articulated Engine

Fast

Dual Airpump

113

Cam Synchronized

None

Single Airpump

128

Cam Synchronized

None

Dual Airpump

129

Table L. CV 112,

Exhaust Mode and Airpump Selection

*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

Tsunami Steam Sound User’s Guide

Page 45

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