HSP volume control?
At the moment, the headset hears my phone playing music, and a voice from the 550. I've opened the voice selection and pick a new voice to force the 550 to "speak". And here's where the wheels fall off.
There's no gain control for the 550 - 20S link. The sound is at 100% and that's it. There's no obvious gain control to back off the loud voice. I've come up with a somewhat effective workaround of boosting the phone's audio level so I can turn down the 20S' overall volume. But this really just a workaround.
There's no volume slider in the quick settings page. Is there any way to drop the volume of the voice coming from the 550? I think that much of the problem comes from HSP limitations, but maybe not?