Page 34 H0 Sound Decoder MX640
CV
Designation
Value
range
INC
steps
De-
fault
Description
volume at full accel-
eration
eration is set with CV #283 (default: 255 = full vol-
ume).
If CV #281 = 1 (acceleration threshold set to 1
speed step), the volume defined here is applied
with every speed increase (even if increased by
just 1 step).
LEAD
- CV
#284
Threshold for
deceleration sound
0 -255
(internal
speed
steps)
1 1
Steam chuffs should be played back at less vol-
ume (or no sound at all) signifying the reduced
power requirement during deceleration. The
sound reduction logic is analog to a reversed
acceleration (per CV #281 to #283).
= 1: Reduces sound to minimum (as per CV
#286) when speed is reduced by just 1 step.
= 2, 3 ... sound reduced to minimum after
lowering speed by this number of steps.
#285
Duration of reduced
volume on
deceleration
0 - 255
=
0 - 25 sec
10
30
=
3 sec
After the speed has been reduced, the sound
should remain quieter for a specific time (analog
to the acceleration case).
Value in CV #285 = time in tenths of a second!
#286
Volume level during
deceleration
0 - 255
10
20
CV #286 is used to define the chuff volume during
deceleration (Default: 20 = pretty quiet but not
muted).
If CV #284 = 1 (deceleration threshold set to 1
speed step), the volume defined here is applied
with every reduction in speed (even if decreased
by just 1 step).
LEAD
- CV
#287
Brake squeal
threshold
0 – 255
(internal
speed
steps)
10 20
The brake squeal should start when the speed
drops below a specific speed step. It will be auto-
matically stopped at speed 0 (based on back-EMF
results).
#288
Minimum driving time
before brake squeal
0 - 255
=
0 - 25 sec
10
50
The brake squeal is to be suppressed when an
engine is driven for a short time only. That is usu-
ally a shunting run and often without any cars (in
reality it is mostly the cars that are squealing not
the engine itself!).
Note: Brake squeal sounds can also be assigned
to a function key (see allocation procedure CV
#300 = …), with which they can be played manu-
ally or stopped!
#289
Thyristor control:
Sound pitch for step-
ping effect
of
ELECTRIC engines
From SW version 20
1 - 255
10
1
The pitch of the thyristor control sound of many
engines (typical example: Taurus) should not as-
cend evenly but rather in steps.
= 1: no stepping effect, even ascend
1 - 255: ascending scale according to the corre-
sponding speed step interval.
LEAD
Thyristor control:
0 - 100
10
40
Percentage of the increased pitch of the thyristor
CV
Designation
Value
range
INC
steps
De-
fault
Description
- CV
#290
Sound pitch at me-
dium speed
for
ELECTRIC engines
From SW-version 20!
sound at medium speed compared to standstill.
Define the “medium speed” in CV #292.
= 0: no change, pitch remains the same as at
standstill.
= 1- 99: corresponding change in pitch
= 100: pitch doubled already at “medium speed”.
#291
Thyristor control:
Sound pitch at
maximum speed
for
ELECTRIC engines
From SW-version 20!
0 - 100
10
100
Percentage of the increased pitch of the thyristor
sound at maximum speed compared to standstill.
= 0: no change, pitch remains the same as at
standstill.
= 1- 99: corresponding change in pitch
= 100: pitch doubled at “medium speed”.
#292
Thyristor control
Speed step for
medium speed
For
ELECTRIC engines
0 - 255
10
100
Internal speed step defined as “medium speed”
for the pitch level according to CV #290.
The CV’s #290 – 292 form a three-point charac-
teristic curve for the pitch of the thyristor control
sound, starting at standstill, whenever the original
sample is being played back.
LEAD
- CV
#293
Thyristor control
Volume at steady
speed
for
ELECTRIC engines
0 - 255
10
30
Thyristor control-sound volume at steady speed
(no acceleration or deceleration in process).
Note: sound changing to load will be set with CV’s
#277 and up but is not yet possible with SW-
Version 4.
#294
Thyristor control
Volume during
acceleration
for
ELECTRIC engines
0 - 255
10
100
Volume during heavier accelerations; the value in
CV #294 should be larger than in CV #293 to be
useful (so that the volume increases when the en-
gine accelerates).
At lesser accelerations a lower volume is selected
automatically (exact algorithm is not finalized with
SW-Version 4).
#295
Thyristor control
Volume during
deceleration
Motor sound of
ELECTRIC engines
0 - 255
10
50
Volume during heavier decelerations (braking);
the value in CV #295 may be higher or lower than
in CV #293, depending on whether the thyristors
are stressed during power feedback to the net
(which increases the volume) or not (which rather
decreases the volume).
LEAD
- CV
#296
Motor sound,
highest volume
for
ELECTRIC engines
0 -255
10
100
Maximum volume of motor sound at full speed or
at the speed defined by CV #298.
#297
Motor sound,
where sound
0 -255
10
30
Internal speed step at which the motor sound be-
comes audible; the sound starts quietly at this
