Page 50 MS - SOUND decoders MS440 to MS990 and MN - NON-SOUND decoders MN170 to MN340
The following procedure enables the (subsequent) adjustment of driving sound to engine load (i.e. in-
clines, pulling weight
…), such as steam chuffs (volume and sound) with the CVs #275, #276…
Technical background:
The load-dependent sound is based on EMF (Electro Motive Force) measurements inside the decoder, which is
primarily used for keeping the motor speed constant during load changes. Before the decoder can produce the
correct sound for the respective driving conditions it has to know first what these
measurements are at normal “no-
load” cruising speed (smooth rolling of the engine or train on straight and level track). This “basic load” of an engine
or train is often considerably higher on model trains than on the real railroad, which is due to gearbox losses, power
pick-
ups etc. Deviations from this “basic load” will then be interpreted as inclines or declines, which triggers appro-
priately modified chuff sounds.
Initiated with pseudo programming
CV #302 = 75
an automated test run is performed to record the “basic load” factor in forward direction;
By
CV #302 = 76
an automated recording run is performed in reverse direction, for locomotives that have different “basic
loads” in this direction (otherwise, the basic load in reverse is considered identical to forward).
The measured results are stored in
CVs #777 and #778
(slow/fast PWM values, forward) and
#779
and #780
(PWM values in reverse direction); these CVs can be read out and used as needed for other
vehicles, or used as base for further tests.
In case the test run is started in SERV PROG, it is important that immediately after the CV command
in CV #302 the SERV PROG is left (with ZIMO controllers the the E-key, or with the MX32/FU the E-
key is pressed twice), so the motor starts. Please do not conduct the test drive on a roller test bench,
because with higher speeds it can lead to losses of contact.
The CVs in the following table have the same meaning for all types of power (Steam, diesel, electric):
NOTE
: The
default values
of individual CVs are
NOT decoder-specific,
but rather depend on the
decoder’s
sound project.
This means that a HARD RESET with CV #8 = 8 returns the decoder to
the state defined by the sound project. The default values in the following table refer to the values
defined in THIS sound project for Roco BR85.
CV
Denomination
Range Default Description
#266
Total volume
(Multiplier)
0 - 255
=
0 - 400 %
64
=
100 %
The default value “64” results in the (mathematically) highest
possible distortion-free playback volume; but values of up to
100 may nonetheless be practical.
Recommended: CV #266
= 40 - 90
#310
ON/OFF key
for
Driving sound vol-
ume and
Random Sounds
0 - 28,
255
1
Function key to turn ON/OFF driving sounds (steam chuffs,
boiling, blow-off, brake squeal, or diesel motor, thyristor
sounds, etc.) as well as random sounds (air brake pump, coal
shoveling, ...).
= 8: F8 key switches driving sound ON or OFF.
Note: this is the default key for ZIMO original sound projects;
OEM projects (i.e. ROCO) often use other settings. Mostly 1 for
the F1 key.
= 0 - 28 F0 - F28 as ON/OFF-key for driving noise.
= 255: engine and random sounds are always ON.
#311
ON/OFF key
for
function sounds
0 - 28
0
Function key assigned as ON/OFF key of function sounds (i.e.
F2
– whistle, F6 – bell etc.).
= 0: does not mean that F0 is assigned for this task but rather
that the function sounds are always active.
= if the same value is entered here as in CV #310, the key de-
fined in #310 turns all sound ON/OFF.
= 1 - 28: Separate ON/OFF key for function sound.
#312
Blow-off key
0 - 28
13
See chapter 5.4 SOUND: Steam engine
(does not belong in this chapter, despite the correct number sequence)
#313
“Mute key”
fade in/out time
key
0 - 28
101 - 128
114
This CV assigns a function key with which the driving sounds
can be faded in and out, i.e. when the train disappears behind
scenery. In many sound projects
CV #313 = CV #310, i.e. the same value in both CVs, there-
fore all sounds are faded in/ot.
= 0: No mute key or mute function.
= 1 - 28: Corresponding function key F1 - F28.
= 101
– 128: Assigned function key with inverted action.
#314
Mute
–
fade in/out time
0 - 255
=
0 - 25 sec
0
Time in tenths of a second for sound fading in/out when mute
button is pressed. Total range is 25 seconds.
= 0 (to 10): Minimum 1 sec
= 11 -
255: longer “mute”-processes
#376
Driving sound
Volume -
(Multiplier)
0 - 255
=
0 - 100 %
255
=
100 %
To reduce the driving sound volume (e.g. Diesel motor with re-
lated sounds such as turbo charger) compared to the function
sounds.
NOTE
: A “heavy” train (a train with higher rolling resistance due to power pickups of lighted coaches
for example) may have a different “basic load” than an engine with nothing on the hook. A separate
recording run may be required for such situations in order to obtain the best load dependent sound.
ATTENTION
: the engine (or train) is
driven automatically
in forward direction for which unoccupied
track must be available of
at least 5 meters (15 feet),
with absolutely no inclines or declines and
without any (tight) curves.
Summary of Contents for MS450
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