Page 46 Non-Sound Decoder MX618 - MX638 and Sound Decoder MX640 - MX659
CV
Denomination
Range
INC-
step
De-
fault
Description
#312
Blow-off key
0 - 19
-
4
=
F4
Defines a function key to playback the blow-off
sound manually, for shunting with open cylinder
valves for example (that is the same sound pro-
grammed with CV #300 = 133 for automated play-
back).
= 4: usual blow-off key
= 0: no key assigned (use this setting if keys are
needed for other purposes).
#354
Steam chuff
frequency
at
speed step 1
also see CV #267 in
this table
1 - 255
-
0
CV #354 works only if used together with CV
#267!
CV #354 compensates for the non-linear speed
measure
ments of the “virtual cam sensor”:
While the adjustment of CV #267 is done in the
vicinity of speed step 10 (slow but not very slow),
a correction for speed step 1 can be performed
with CV #354 (extremely slow).
= 0: no effect
= 1…127: more chuff beats in relation to CV #267,
= 255…128: less chuff beats.
#154
Several special bits
Bit 1 = 1: DIESEL, ELECTRO: Drive off immedi-
ately even if playback of idle sound has not yet
finished.
Bit 2 = 1: DIESEL, ELECTRO: Wait for idle sound
before taking off.
Bit 4 = 1: STEAM: Two stage compressor (Z1 for
fast refill after coming to a stop, Z2 for slow pres-
sure loss compensation during longer stops).
Bit 7 = 1: STEAM: Delay start until playback of
start-up whistle has finished.
Other bits: OEM Special applications (i.e. Panto
control etc.)
#158
Various special bits
-
0
Bit 0 = 1: SPECIAL MX648: Function output FO1
is used for an automatic control wire of an exter-
nal energy storage.
Bit 1 = 1: DIESEL-MECHANICAL: No RPM
increase when braking (see CV #364).
Bit 2 = 0: RailCom actual speed (kph) feedback in
“old” format (for MX31ZL, RailCom ID 4).
= 1: RailCom actual speed (kph) feedback in
current format (RailCom ID 7).
Bit 3 = 1: “Looped” driving sounds will be faded
out when switching to a different speed
step in order to shorten the sounds.
Bit 4 = 1: Steam chuff frequency increases slower
at high speed (non-proportional)
Bit 5 = 1: Braking (even by one speed
step) causes the motor and turbo
sounds to decrease by on sound step.
CV
Denomination
Range
INC-
step
De-
fault
Description
Bit 6 = 1: Thyristor sound may be louder when
braking (even if the volume is supposed
to decrease according to CV #357); see
CV #357.
Bit 7 = 1: SPECIAL MX645: ELECTRIC: Flashes
of light (approx. 0.1 sec) on FO7 when
switch gear sound is played.
#394
Sample crossfading
0 - 255
-
0
Bit 0 = 1: SPECIAL MX645: ELECTRIC: Flashes
of light (approx. 0.1 sec) on FO6 when
switch gear sound is played.
Bit 4 = 1: Faster acceleration when speed
regulator fully opened.
Bit 5 = 1: Crossfading of chuff samples
5.6 Steam engine
Load and acceleration dependency
The
load dependency
of the sound is
based on the current engine
load
and
the
acceleration / decel-
eration.
The result of the “basic” load test run serves as reference for the current motor load, see sec-
tion 5.3 "The
test run for determining the motor’s basic load”.
NOTE: ZIMO large-scale decoders MX695 and up, and possibly some of the smaller decoders (but
not the current MX640
– MX648’s) contain a position and acceleration sensor that will improve the
function of load dependency dramatically, once it is activated with future software versions.
To set up load dependent sound, follow the
instructions in this order:
+
Perform
"
The test run for determining the motor’s basic load”
; see chapter 5.3
+
Adjust CV’s #275 and #276
+
Adjust CV #277
+
If needed CV #278 and #279
NOTE: The CV’s in this chapter affect the sound volume according to load (that is, by how much the
volume should increase at higher loads or decrease at lesser loads, all the way down to mute if nec-
essary). A possible exchange of sound samples at load increase or decrease is however a matter of
the sound project. There are special exceptions to this rule, though...
NOTE: The
default values
listed for the individual CV’s are typical guidelines only,
as actual
values in operation are determined by the loaded
sound project;
this also means that a HARD
RESET with CV #8 = 8 restores the values back to the definition in the sound project.
