My search-fu has failed me. I'm working on a lua script to use mpv as a squeeze* player and the volume fade in/out on pause was battling me a bit. I've changed to script to identify the player as:

Player Model: Squeezebox Touch
Player Type: fab4
Firmware: mpv 0.35.1

And that seems to work around the pause volume fades but I'm still setting device id to "12" which is squeezeplay so that doesn't seem right... does it matter? I can't seem to find the device id that corresponds to a touch.