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Tsunami™ Digital Sound Decoder - page 47 / 77





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Sound Programming

Bell Ring Rate The bell ring rate may be adjusted over 16 steps to simulate the sound of an air-rung bell or a hand-rung bell by setting CV 114 between 0 and 15. A setting of 0 yields the fastest ring rate (like an air-ringer) while higher values produce increasingly slower ring rates. The default setting for CV 114 is four, but as each Tsunami decoder features a different bell recording you may find that tweaking this value a bit improves the overall sound effect on some models.

Bell Volume CV 139 sets the bell volume and may be set between 0 and 255. See Audio Mixer for more details. .

Exhaust Control

Tsunami provides several CVs for setting up the Steam Exhaust Chuff sound effect:

CV 112 Exhaust Configuration CV 116 Auto Exhaust Rate CV 131 Exhaust Volume CV 135 Side Rod Clank Volume

In addition, there are the Dynamic Digital Exhaust (DDE) CVs covered in a later section.

Exhaust Configuration

The first decision to make is whether or not to synchronize the exhaust chuffs to the driver wheel rotation using a mechanical cam switch or to use Tsunami’s Auto-Exhaust. Cam synchronized exhaust has the advantage in that the precise timing and number of chuffs are correctly delivered regardless of locomotive speed or load. The disadvantage is one of a more complex installation.

Also, be aware that if you select cam-synchronized exhaust, the Tsunami will automatically revert to auto exhaust when operating in analog (DC) mode. This is because the cam sensor circuit requires an alternating voltage polarity such as found on a DCC track in order to work properly.

Auto Exhaust Tsunami’s auto-exhaust feature simply produces an (adjustable) exhaust chuff cadence that is proportional to the locomotive speed. Since there is no mechanical switch to worry about, the installation is much easier and ideal for use in locomotives where space is extremely limited. The primary drawback is that the chuff rate is tied to the throttle’s speed setting and not to the actual locomotive speed. If the engine slows down due to a grade for example, the speed change is not reflected in the chuff rate. The solution, then, is to use the Auto-Exhaust in conjunction with Tsunami’s Load Compensation feature (see Step 9), so speed changes due to load and grades are minimized.

Tsunami Steam Sound User’s Guide

Page 44

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