File details:

Digitrax RDC Sound scheme. Copright (c) Digitrax Inc. July 18th 2007

project: rdc.spj
SDF: RDC Diesel Scheme
Author AJ Ireland
Digitrax Inc.

(A) Function Key Usage:

F0- Lights
F1-
F2- Horn, [CV150 selects Horn type]
F3- Coupler crash [Autocoupler/brake set by CV151 max spd]
F4- Air feature disable- F4 to OFF enables pop-off and starts compressor
F5-
F6-
F7- Crossing Gate Airhorn
F8- Mute control, [F8 ON is muted.]
F9- Engine Brake squeal
F10- Crossing gate Airhorn sequence
F11- Sanding cycle
F12- Cab door closing

(B) RDC Sound FX defined CV's: [decoder CV8=8 Factory reset value in sq. brackets]

CV58 Master Volume, 0-15, 0= max, (F8 used for Mute) [9]

CV122 Product TYpe, 12 = Digitrax SFX sound decoder (Read Only Value)
CV123 Hardware Version (Read Only Value)

CV135 Volume when Muted [00]

User configurable SoundCV's:

CV140 PRIME mover vol 0-64 [60]
CV142 Horn volume 0-64 [60]
CV143 Air features volume (popoff, comp) 0-64 [30]
CV145 Misc vols 0-64 [40]
CV148 Compressor Start rate [30]
CV149 COMPRESSOR ON time [20]
CV150 Horn Selector 0=std P5 Horn , 1=Playable volume Horn 2=Alternate Horn [0]
CV152 Author ID Digitrax=0xdd [221]
CV153 Project ID RDC [19]

(C) General Notes

Special thanks for RDC sounds recorded by Paul Knowles.

Note: This RDC prime mover has significant low-frequency components at idle and low throttle settings, so the speaker enclosures should be as large as possible behind the diaphragm to extend adequate frequency response below e.g. 300Hz. This will ensure a more "full" sound that does not appear thin or "tinny".

Each engine we have recorded has a distinct 'personality', so a particular locomotive example may sound slightly different due to unique e.g. tappet, crank-rate shell vibrations and exhaust-stack differences. Horns and bells are often moved between locomotives, and some roads may change/upgrade prime-movers, or change a normally aspirated engine with turbo-chargers etc.