Non-Sound Decoder MX600 - MX634 and Sound Decoder MX640 - MX658 Page 43
CV
Designation
Range
INC-
step
De-
fault
Description
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 possible
if decoder has 2 inputs).
LEAD
- CV
#269
Accentuated
lead-chuff
0 - 255
10
0
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 already part of the chuff set but can be further
amplified with the help of CV #269.
#270
PROJECT
not functional yet:
Longer chuff length
at very low speeds
0 - 255
10
?
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.
#271
Overlapping effect at
high speed
0
– 255
(useful
up to @
30)
1
16
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
because 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.
LEAD
- CV
#272
Blow-off duration
also see CV #312
(blow-off key)
0 - 255
=
0 - 25 sec
10
50
=
5 sec
Opening the cylinder valves on a prototype steam
engine for the purpose of water drainage is entire-
ly 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. Auto-
mated blow-off and function key blow-off are inevi-
tably the same (as per selection/allocation).
= 0
: no blow-off sound playback
#273
Start-up delay
during blow-off
0 - 255
=
0 - 25 sec
1
0
Opening the cylinder valves and with it the related
blow-off sound on a real steam engine starts most
often before the engine even starts to move.
This can be imitated with CV #273 by automatical-
ly delaying the start of the locomotive.
This effect is cancelled when a shunting function
with momentum deactivation is being activated
(see allocation of F3 or F4 in CV #124!)
= 0: no delayed start
CV
Designation
Range
INC-
step
De-
fault
Description
= 1: Special setting for blow-off via speed
regulator; no start-up delay, but setting the
speed to the lowest speed step causes the
blow-off sound to be played without powering
the motor (only with 128 speed steps).
= 2: Start-up delay in tenths of a second,
Recommendation: no value > 20 (> 2 sec)
#274
Blow-off schedule
start-up whistle
schedule
0 - 255
=
0 - 25 sec
10
30
Constant opening and closing of the cylinder
valves in real shunting operations, that often re-
quires many short trips with associated idle times,
is usually omitted. CV #274 causes the blow-off
s
ound to be suppressed if the engine wasn’t
standing still for the time defined here.
Value in CV #274 = time in tenth of a second!
The same stop-time is also used for the start-up
whistle!
#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.)
