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Adjusting the Sound Effects
13.3. Manual notching (Diesel locomotives only)
Usually, the LokSound V4.0 decoder automatically selects the die-
sel speed notch appropriate for the desired speed. However, in
some cases where the train has to pull heavy loads, you may want
to "shift gears" manually to get higher overall engine RPM.
The LokSound V4.0 offers a feature we call "Manual notching".
However, this feature does not mean that you have to manually
adjust all speed steps every time. This would cause a lot of user
action.
Instead, if you enable the function key in some of the LokSound
sound projects, the decoder will automatically increase an "offset"
to the current diesel notch. This offset will automatically increase
as you crank up the throttle resulting in a general higher engine
RPM. This will result in a much easier operation while maintain-
ing the possibility to increase the diesel RPM when needed (e.g.
hill starts).
Manual notching works only while the train is moving. While
idling, the function key has no influence on the diesel notch.
You can define how many notches will be increased after press-
ing the function key. The value is set in CV 131. It can comprise
a value between 0 and 255. The default value of 50 results in an
increase of 2 diesel notches. The higher the value stored in CV
131, the more diesel notches will be increased.
13.4. Synchronising the steam chuff (Steam locomotives only)
To synchronise the steam chuff with the wheel revolutions, you
may use an external cam as described in chapter 6.9. However,
most users prefer not do such massive changes on their valuable
locomotives and prefer to use the automatic exhaust mode of the
LokSound V4.0 decoder. Because of the excellent Back-EMF func-
tion, the synchronisation will be satisfying most users.
To enable this function (and disable any external cam at the same
time), CV 57 and CV 58 are used. All you need is a stop-watch
and a little time. It pays to spend some time in order to achive an
optimal result. Please make sure that the load control is perfectly
adjusted to your loco and set the maximum / mimimum speed
according to your wishes. After doing so, you should start to syn-
chronise the steam chuff.
In CV 57, the distance between two steam chuffs at the lowest
possible speed (at speed step 1) is defined. The unit of CV 57 is
a multiple of 32 ms (Milliseconds). In CV 58, you need to give
the LokSound V.40 some information about the gearing of your
engine.
Please proceed as follows:
1. Put the engine onto the track and drive it with speed step 1
and switch the sound on.
2. Using the stop-watch, measure the time in seconds it takes the
driver to complete one turn at this speed.
3. Divide the time by 0.128 (assuming you are using a 2 cylinder
or 4-cylinder locomotive)
4. Enter a rounded value without decimal point in CV 57. We
recommend to use POM to be able to observe the result im-
mediately.
5. Observe the locomotive and check if now 4 steam chuffs will
be reproduced per revolution. If needed, adjust the value of CV
57 gradually by increasing or decreasing the value one by one.
6. If you are satisfied, increase the speed of your locomotive to
speed step 4 (of 28).
7. Try to observe, if still four steam chuffs per revolution can be
heard. If you find that there are too many steam chuffs, in-
crease the value of CV 58 (defaults to 43). If they are too slow,
53
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