Rider 550 Bluetooth volume control
I currently use a Garmin 660. I also use a Sena 20S intercom. The 20S can, concurrently, do a A2DP media connection to a phone (Android Samsung S7) and an HFP connection to the Garmin 660. But... there is no volume control for the 660 in BT mode. That means the voice prompts, etc. come blasting into the headset. Drop the 20S' volume to the point where the 660's volume is usable and the phone is now almost inaudible.
I managed something of a workaround by finding a music app that can be really loud, so I can drop the 20S' volume and make the 660 sound usable. But this is all a collection of workarounds.
Does the Rider 550 have a direct BT volume control?