I assume the music function works the same on the 395 as my 595. I have my Sena paired only to my phone, and the Garmin to my phone. This way, music is streamed directly from my phone to the headset, but I can control it from the Garmin UI.
I'll have to try that out.
My workaround was to pair my Sena directly to my iPhone and bypass the Garmin entirely. I don't really use voice guidance or audio route alerts, so I'm not missing out on much on that end.
I can use the Sena jogdial to play/pause/FF/RW/volume +/-, but it would be nice to scroll through a playlist on the GPS instead of just having it start from the last song in the shuffle.