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Digitrax General Electric AC4400 Sound scheme. Copright (c) Digitrax Inc.

Digitrax Kato AC4400 / SDH104k1A - SOUND Decoder "VERSION 4" Oct 9th 2007

This is a modified NOTCH scheme and includes a "short horn blow" capability using CV156 - Moved F10 sequence to same priority as F7, AVOIDS scattered air events (F4 off) causing delays

project: ac4400_4.spj
EVO SDF: Ac4400 Diesel Scheme
Author AJ Ireland
Digitrax Inc.

(A) Function Key Usage:

F0- Lights
F1- Bell
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,drier and starts compressor
F5- Dynamic brake Fans
F6- Manual Notch UP, if CV155 is not 00
F7- Crossing Gate Airhorn - or Manual Notch DOWN, if CV155 is not 00
F8- Mute control, [F8 ON is muted.]
F9- Brake squeal
F10- Crossing gate Airhorn sequence
F11- Handbrake

(B) AC4400 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]

CV121 Software Version, MUST be 2 or higher [3] (Read Only Value)
CV122 Product TYpe, 12 = Digitrax SFX sound decoder [12] (Read Only Value)
CV123 Hardware Version, 17= SDH104K1 decoder [17] (Read Only Value)
CV124 Flash Signature [2] (Read Only Value)
CV125 16KB free blocks [0] (Read Only Value)
CV126 FAT flags [7] (Read Only Value)
CV127 Internal Flags [0] (Read Only Value)
CV128 IPL counter [0] (Read Only Value)

CV132 Notch rate [127]
CV135 Volume when Muted [00]

User configurable SoundCV's:

CV140 PRIME mover vol 0-64 [60]
CV141 BELL vol 0-64 [25]
CV142 WHISTLE volume 0-64 [60]
CV143 Air features volume (popoff, drier,comp) 0-64 [30]
CV145 Misc vols 0-64 [40]
CV146 BELL delay (24mS counts) 1-100 [7]
CV147 Drier rate, 1= about 2secs 1-64 [2]
CV148 Compressor Start rate [30]
CV149 COMPRESSOR ON time [20]
CV150 Horn Selector 0=std Horn , 1=Playable volume Horn 2=Alternate Horn [0]
CV151 PEAK speed to allow AUTO coupler/brake on DIR change and F3 on. 0-60 [48]
CV152 Author ID Digitrax=0xdd [221]
CV153 Project ID AC4400 [2]
CV154 Unused
CV155 Notching Mode,0=AUTO, 1=SEMIAUTO,2=MANUAL NOTCHES [0]
CV156 Horn DELAY Thresold [10]
CV160 Variant ID [4]

(C) General Notes

Sound recordings courtesy of Paul Knowles, AJ Ireland and Charlie Brown.

The SDH104K1 decoder is used in conjunction with FN04 4 line FX3-type function decoder. SDH104K1 responds as per standard FX3 decoder (e.g. DH163D)for CV1-120. FN04 does not respond to/execute any CV programming in SoundCV (SCV) range CV121-255.
Both decoders have CV15/16 lock capability for advanced users.

For CV155=01 ["Semi_automatic Notching"], the Prime mover lowest Notch setting is set by the throttle speed setting. F6 (ON) can increase the Notch and F7 (ON) will decrease the Prime mover to the minimum notch set by current throttle setting.