V5.0 Class 43 HST Diesel Digital Sound Decoder with Speaker – 21 pin

Key Functions Sound slots Volume CVs Volume values F0 Front light F1 Sound on/off 1 259 128 F2 Horn 1 4 283 96 F3 Horn 2 5 291 96 F4 Straight Air Dump 23 435 64 F5 Drive Hold F6 Door Slam 24 443 96 F7 Air Suspension 12 347 96 F8 Brake 1 11 339 64 F9 Flange 15 371 96 F10 Spirax Valve 9 323 64 F11 Guards Whistle 10 331 64 F12 Coast F13 AUX1 [1] F14 AUX2 [1] F15 Uncoupling cycle F16 Volume control F17 AUX3 F18 AUX4 F30 32 507 64

Make sure that index CV31 is set to 16 and index CV32 is set to 1 before changing a volume CV.