820 Singrovka – 8bit MTB TT Next18

Project version 214.3.4
820 Singrovka – 8bit MTB TT Next18
8bit

Sound sample

Project Information

  • Optimised for the MTB TT model with a Next18 connector.
  • Designed for 8-bit ZIMO MX sound decoders.
  • Recommended minimum decoder software version is 40.22.
  • The factory default address is 3.
  • Program CV8 = 8 to reset the decoder to the project defaults.

Function Assignment

Function mapping and CV settings can be modified.

  • F0 White marker lights
    Affected function output: FA0v, FA0r
    Direction dependent
  • F1 Red lights
    Affected function output: FA1, FA2
    Direction dependent
  • F2 Headlight
    Affected function output: FA4
    Direction dependent, linked to F0
  • F3 Shunting mode
    Affected function output: FA0v, FA0r
    • speed range reduced to ½
    • reduces acceleration / braking times to ¼ of CV3 and CV4
    • turns off red lights if enabled
    • turns off headlight if enabled
    • triggers a short horn at start
  • F4 Short horn I
  • F5 Coasting
    Idle sound regardless of set speed
  • F6 Engine to maximum RPM
    Independent of set speed, even when stationary
  • F7 Long horn
  • F8 Sound on/off
    Engine on/off
  • F9 Passenger area lighting
    Affected function output: FA3
  • F10 Short horn II
  • F11 Unused
  • F12 Screw coupler down
  • F13 Screw coupler up
  • F14 Sanding
  • F15 Dispatcher whistle – new
    Call to readiness
  • F16 Dispatcher whistle – old
    Call to readiness, departure
  • F17 Compressor
    Also random sound
  • F18 Air release
  • F19 Wheel squeal in curves
  • F20 Station announcement
    Train Os 5048
  • F21 Station announcement
    Train Os 5011
  • F22 Station announcement
    Train Os 5028
  • F23 Station announcement
    Train Os 5016
  • F24 Unused
  • F25 Unused
  • F26 Mute sounds
  • F27 Volume down
  • F28 Volume up

Setting Maximum Speed

Use CV57 to set the maximum speed. Changing CV5 affects the sound range, while CV57 keeps the CV3/CV4 acceleration and braking times untouched.

Shunting Mode

All four marker lights turn on in shunting mode. Disable the feature with CV37 = 0 and re-enable it with CV37 = 3. The mode also turns off the red lights and headlight; override this behaviour by setting CV430 = 0 and back to CV430 = 3 when required.

The mode halves the speed range and reduces acceleration/braking times to a quarter of the CV3/CV4 values. Disable it via CV124 = 16; complete deactivation of the timings is possible with CV124 = 19.

If you do not want to use shunting mode at all, set CV124 = 0. The default value is CV124 = 18.

A short horn sounds at every start in shunting mode. This script-controlled feature requires F3 enabled, engine sound on via F8, and starting from zero speed. CV837 = 8 disables it (default CV837 = 0).

Compressor

The compressor is script-controlled in two ways:

  1. Random activation while the engine sound (F8) is on; enabling F17 cancels the random cycle.
  2. Direct activation via F17 that requires F8 on and zero speed.

CV837 = 1 disables F17, CV837 = 2 disables the random mode, and CV837 = 3 disables both.

Curve Squeal

Curve squeal requires F19 and F8 enabled, plus a speed above 14 and below 100 (range 0–126). Set CV837 = 4 to disable the effect.

Custom Function Mapping

You can customise the function layout via CV400 – CV428. The project itself does not use these CVs.

Decoder Reset

If you make a mistake while configuring the decoder or get lost in the settings, program CV8 = 8 (or CV8 = 0) to restore the project defaults.

Basic CV Settings in Project

  • CV3 = 16
  • CV4 = 14
  • CV5 = 1
  • CV6 = 1
  • CV33 = 1
  • CV34 = 2
  • CV35 = 12
  • CV36 = 32
  • CV37 = 3
  • CV38 = 0
  • CV39 = 0
  • CV40 = 0
  • CV41 = 0
  • CV42 = 0
  • CV43 = 16
  • CV44 = 0
  • CV45 = 0
  • CV46 = 0
  • CV57 = 125
  • CV61 = 97
  • CV105 = 145
  • CV106 = 5
  • CV124 = 18
  • CV125 = 88
  • CV126 = 88
  • CV127 = 90
  • CV128 = 89
  • CV129 = 88
  • CV130 = 88
  • CV190 = 0
  • CV191 = 0
  • CV254 = 214
  • CV255 = 3
  • CV256 = 4
  • CV266 = 110
  • CV339 = 6
  • CV340 = 6
  • CV374 = 5
  • CV395 = 130
  • CV396 = 27
  • CV397 = 28
  • CV430 = 3
  • CV432 = 194
  • CV433 = 196
  • CV434 = 193
  • CV435 = 196
  • CV836 = 0
  • CV837 = 0

Sound Sample Numbers

F4 CV522 24 Short Horn I
F7 CV531 22 Long Horn
F10 CV540 26 Short Horn II
F12 CV546 27 Screw Coupler Down
F13 CV549 28 Screw Coupler Up
F14 CV552 25 Sanding
F15 CV555 29 New Dispatcher Whistle
F16 CV558 30 Old Dispatcher Whistle
F20 CV540 333 Train Os 5028 Announcement
F21 CV543 34 Train Os 5016 Announcement
F22 CV546 35 Train Os 5048 Announcement
F23 CV549 36 Train Os 5011 Announcement
script 31 Compressor
script 32 Wheel Squeal in Curves

"Script" means that the corresponding sound is used inside a script outside the normal CV mapping. The number is provided for standalone use when the script is disabled.