Alexa_media_player-based automations

Hi everyone!

I’m looking for events (state change, etc…) to use to trigger automations.
I use some echo dots to play music, from phone to echo via Bluetooth, to various p.a.

The result I’m aiming is to avoid “blips” and messages when the phone disconnects.
I’m thinking something like “when echo goes to idle, set volume to zero”, since no music is played when walking out from the room, and then “when states changes to active, set volume to 1”.

Unfortunately, when music is streamed via Bluetooth to echoes, nothing changes in the log… Or so it appears. Can someone please confirm this?