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Page 36 Non-Sound Decoder MX618 - MX634 and Sound Decoder MX640 - MX648

ZIMO cab key arrangements:

(((((

A sound project is

composed of…

... sound samples, schedules and CV settings

To produce the sound of a locomotive, the sound sample contains the following components:

the

"main engine"

sound

: this is the central sound, such as the chuff or diesel engine

sound, or the cooling fan (which is the key sound in electric locomotive projects).
This "main engine" sound is the only sound component associated with a

schedule

, which

defines important properties, especially the transitions between different sound samples in
various speed, acceleration and load situations.
This schedule can only be changed in the "ZIMO Sound Programmer" ZSP, not by CV's.
However, there are numerous possibilities for

fine-tuning

the main engine sound

through

CV’s

(e.g. relation between chuff frequency and speed, lead-chuff accentuation, coast-

ing/notching functions, etc.)

Other

scheduled sounds

(often inaccurately called background sounds): these are boiling,

draining, turbocharger or brake squealing sounds and many others; also in the case of elec-
tric locomotives the actual primary sounds of the thyristor unit and the electric motor.
"Scheduled" sounds - both the "main engine" and "other" - are characterized in that the de-
coder plays them back automatically based on the driving situation, while the "function
sounds" (see below) are activated with the cabs function keys.
These "other" -sounds (i.e. all except the "main engine

” sound, see above) are NOT played

back according to a schedule, i.e. they are

fully defined by CVs

and can be modified

di-

rectly by the relevant CV

’s or CV # 300 - procedures, even in operation (speed, load depend-

ence, etc.). Only the underlying original recordings that is, the sound sample or a selection of
samples, is stored in the sound project (or in the sound collection).

The

function sounds

, which are played back by pressing the corresponding function keys

includes acoustic signals such a whistles, horns, bells but also other sounds like coal shovel-
ing, coupler clank, lowering of pantographs as well as station announcements.
The volumes of each sound

and whether it is “looped” (for continuous playback as long as

the function key is pressed) is

defined by CV’s

but can also be

modified by these CV’s

with the CV #300 procedure. Here too, only the sound samples of the project or selections of
several projects are predefined.

4) and 5) the

switch input

and

random sounds

are normally sounds that can also be used as

function sounds but are triggered by switch inputs or random generators.

The occasionally used term "driving sound" refers to a subset of all the sounds, namely the "main en-
gine" sound and most of the "other" sounds; the "departure whistle" sound for example is not included
because it is not dependent on driving data.

5.1

The “CV #300 procedures”

The term "CV # 300 - procedure" means the "pseudo-programming" of CV # 300, which allows the

modification of the currently loaded sound project

during normal operation, in relation to:

the

selection

of sound samples within the various sound groups (i.e. “ short whistle”), if it is

a “sound collection” (which has several sound samples in some of its sound groups) or a
“normal” sound project with several sound samples in certain groups.

the

volume

and the sound

loop

behavior of individual sounds; for example, setting the

whistle volume different to the driving sound volume (i.e. chuff beats).

All CV #300 procedures must be done in operations mode (on the main), NOT in service mode!

NOTE

: If setting the volume of individual sounds is the main concern, it is more convenient to use

the direct CVs, see chapter "Drive-independent basic settings"; in many applications the CV #300
procedure is therefore NOT needed.

A more convenient procedure (w/o manual CV #300 programming) is available with MX31/MX32 cabs

Selecting another chuff set (if several sets are present in a sound collection):

(only possible for steam projects, not for diesel or electrics)

The following procedures are always used in the same way in spite of the flexible decoder layout with
different sound sample compilations. It is also worth mentioning that the sound samples can be lis-
tened to and evaluated under actual operating conditions (with the engine running), not just on the
computer.

The

selection procedure

is started with a “Pseudo-Programming” in operations mode (“on-the-

main”):

CV #300 = 100 (only for steam / not possible with DIESEL engines!).

The “Pseudo-Programming” (meaning that the entered value is not really stored in memory) has the
effect that the

function keys F0 to F8

no longer actuate function outputs but instead are now availa-

ble for

special tasks

within the sound selection procedure. The function keys should be set to mo-

mentary, if possible, which would facilitate the procedure.

CV #300 procedures must be done in

operations mode (on the main), NOT in service mode!

The function key identifications (and the MX31/MX32 cab displays) shown are typical for a ZIMO cab
during the selection procedures (and for other sound adjustment procedures) but

is analog to the

function keys of third party cabs,

although the keyboard layout may be different.

The function keys have the following special

meaning during the selection procedure!