There are more sound functions in a recently purchased HO GG1 (Soundtraxx Digital Sound Decoder) than listed in the Quick Start Guide that came with the engine and fewer than in the Econami reference manuals for electric locomotives on the Soundtraxx site. I searched and was unable to find what sounds are produced by F4, F5, and F6. F4 may be raising and lowering the pantograph, per the Econami reference manual. Someone suggested that F6 is the air compressor with air release. I have no information about F5.
Most of the sounds have a default volume that I find acceptable, but F5 is too loud. Which CV controls the volume of the F5 sound? The CV table leads me to guess that its either 131, described as exhaust volume control, or 134, blower volume.
From memory - (do not have convenient access to a GG1 to verify)
The assigned DCC function control for the GG1 equipped with Sound Value decoder:
F0 - Headlight - Backup light
F1 - Bell
F2 - Horn (long)
F3 - Horn (short)
F4 - Pantograph operation sound
F5 - Blower
F6 - Compressor
F7 - Dim
F8 - mute all sounds
F9 - F12 not assigned
CV 39 controls F5 and CV 134 controls Blower volume
Click Here (http://www.soundtraxx.com/factory/OEM_pages/bachmann/ho_gg1_sv.pdf) for supported CVs and their default value. (I have not checked)
Econami reference manuals cannot be used with a Sound Value decoder.
More . . .
Quick glance over the CVs list
CV 50 = 142 --- expect you will find reading the decoder CV 50 = 141