SoundTraxx Tsunami Steam Users Guide - Manual (Page 54)

Tsunami Steam Sound User’s Guide Page 51
The Attack and Release Time Constant CVs determine how quickly the DDE
reacts to a change in load or throttle. The Attack CV sets how fast the effect
turns on when the load or throttle is increased while the Release CV set how
fast the effect turns off when the load/throttle is decreased.
Each CV may be set between 1 and 255 with higher values producing
faster response times. Generally, you will want to set CV 179 and 180 to
the same value. Be careful not to set these CVs too high as it will allow the
DDE to react to even minor changes in load such as occurs when traversing
a turnout or slight change in track radius. This can result in rapid or erratic
changes of the chuff volume and is quickly solved by lowering the attack and
release CV settings.
CV 181, DDE Exhaust Low Volume Limit
CV 182, DDE Exhaust High Volume Limit
CV 183, DDE Side Rod Clank Low Volume Limit
CV 184, DDE Side Rod Clank High Volume Limit
These four CVs determine how much the exhaust and side rod clank sound
volumes will be boosted or cut in response to the motor load and throttle.
Each CV may be set anywhere between 0 and 255. A setting of 0 results in
no change to the volume level while a setting of 255 corresponds to roughly a
12dB or 4X increase or decrease in volume level.
It is important to remember that these CVs do not set the actual volume level
but rather control the percentage of change. The baseline volume level of
exhaust or rod sound effects must still be set with the audio mixer level CVs
(CV 131 for exhaust chuff and CV 134 for the rod clank).
Be careful not to set the baseline volume level too high or too low as the DDE
cannot increase or decrease the volume beyond its maximum or minimum
settings of 0 and 255 regardless of how high you set CV 181 thru 184. In
other words, even though the DDE can increase the exhaust volume by up to
4 times (400% or +12dB), if the mixer level is set to 255, no further increase
will occur. Similarly, if the mixer is set to 128, then the maximum volume
change possible with the DDE is 255/128 or about 199% (+6dB).
CV 185, DDE Baseline Frequency
CV 186, DDE Control Gain
CV 187, DDE Filter Damping
These CVs influence the DDE’s ability to modify the exhaust chuff pitch and
timbre.
CV 185 sets the baseline or ‘no load’ timbre of the exhaust chuff and can be
set between 1 and 255. Lower values will give the exhaust chuff a ‘boomier’
sound but only to the extent that your speaker can handle the increased bass
levels.
CV 186 determines how much the exhaust chuff pitch/timbre will vary in
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