SoundTraxx Tsunami Steam Users Guide - Manual (Page 47)

Tsunami Steam Sound User’s Guide Page 44
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.
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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.
Sound Programming