Large-scale Decoder & Sound Decoder MX695, MX696, MX697, MX699 Page 49
Note: The CV immediately ahead of the CV’s listed (# 740, 742) contain the sound sample numbers to be
played.
Random sounds - Volume adjustments:
Volume setting for sound activated by random generator Z1
Volume setting for sound activated by random generator Z2
Volume setting for sound activated by random generator Z3
Volume setting for sound activated by random generator Z4
Volume setting for sound activated by random generator Z5
Volume setting for sound activated by random generator Z6
Volume setting for sound activated by random generator Z7
Volume setting for sound activated by random generator Z8
Note: The CV immediately ahead of the CV’s listed (#744, 747 etc.) contain the sound sample numbers to be
played.
7.5 Steam engine
Basic sound settings
The following CV’s can be programmed both “normal” (i.e. CV #... = ...) and “incremental”.
“Incremental programming” is especially useful when the proper value cannot be calculated in
advance and must be determined by trial, which is often the case with many sound parame-
ters.
The “Lead CV” in each case is the first of 3 consequential CV’s that are edited and shown on
the same screen of a ZIMO MX31/MX32 cab during the “incremental programming” proce-
dure.
See chapter
5.4 “Basic settings independent of powertrain”
Chuff sound
frequency with
“virtual cam sensor“
also see CV #354 in
this table
(chuff frequency at
speed step 1)
CV #267 is only active if CV #268 = 0:
Chuff beats follow the “virtual cam sensor”; an ac-
tual cam sensor is not needed in this case.
The default setting “70” results in about 4, 6 or 8
chuffs per wheel revolution, depending on the chuff
set selected; because it also depends in large part
on the motor and gearbox used, an individual ad-
justment is necessary in most cases in order to
achieve the exact chuff frequency. This is the pur-
pose for CV #267:
The lower the value the higher the chuff frequency
and vice versa. The setting should be performed at
a low speed (around speed step 10), but not at the
lowest speed step 1.
Switching to real
cam sensor
and
trigger count for chuff
rate
and
Special function for
“Simple articulated”
steam engines
= 0: “Virtual“ cam sensor is active (to be adjusted
with CV #267, see above).
= 1: real cam sensor is active (connected to
switch input 2 of the MX640, see chapter 6);
each negative spike results in a chuff beat.
= 2, 3, 4 … real cam sensor, several triggers in
sequence (2, 3, 4 …) result in one chuff beat.
= 128
(Bit 7=1 with “virtual” cam sensor): second
driver is a bit slower; only meaningful if a
second sound sample is available in the
sound project.
(Bit 7 = 1 with real cam sensor, see above for val-
ues): Cam sensor for driver 1 on IN3 (as usual),
Cam sensor for driver 2 on IN2 (only possi-
ble if decoder has 2 inputs).
= 192 (Bit 6 and 7 = 1): When no separate sound
sample is available for the second driver, the
same sample is played back for the second
driver albeit a bit slower.
A typical sound signature of a passing steam en-
gine is that one chuff out of a group of 4 or 6 chuffs
is louder in volume than the rest; this effect is al-
ready part of the chuff set but can be further ampli-
fied with the help of CV #269.
PROJECT
not functional yet:
Longer chuff length
at very low speeds
PROJECT (not yet implemented):
The chuff sounds of a real engine are extended
when driving at very low speeds due to the me-
chanical valve control. This effect can be more or
less accentuated with CV #270.
Overlapping effect at
high speed
0 – 255
(useful
up to @
30)
The individual steam chuffs of a real engine over-
lap each other at high speed. Because the fre-
quency of the chuffs increases but won’t shorten to
the same extend they will eventually blend in to a
weakly modulated swoosh.
This is not always desired in model railroading be-
cause it doesn’t sound that attractive, hence CV
#271, with which an adjustment is possible to have
the chuff beats accentuated at high speed or rather
fade away.
Blow-off duration
also see CV #312
(blow-off key)
Opening the cylinder valves on a prototype steam
engine for the purpose of water drainage is entirely
up to the engineer. An automated draining at start-
up is more suitable in model railroading; CV #272
defines how long after start-up the blow-off sound
should play.
Value in CV #272 = time in tenth of a second!
Note: If the blow-off sound is also allocated to a
function key (as delivered on F4, see CV #312),
the automated blow-off sound can be shortened or
extended with the relevant function key. Automated
blow-off and function key blow-off are inevitably the
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