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First time I've ever seen this module used, Mike. I looked through the install instructions and this is the only thing applicable I see:
For vehicles with Class2 amplifiers, the steering wheel
volume control will control the volume of OnStar. Momentarily
press the steering wheel up/down button to adjust volume
(do not press and hold). Please call SoundGate tech if additional
info is needed.
Our cars DO have outboard amps, whether Delco or Bose.
Soundgate was no help. It does work with the chimes so I think that we are going to button things up and I may order the Peripheral modules and have them swap them out.
If I can get the microphone on the bluetooth to sound better, I'll probably ditch the onstar altogether.