Echo Devices (Alexa) as Media Player - Testers Needed

You can easily make this your own. Just create a new Input_number (slide) and connect it (using my formula) to the volume controls from the single entities in the group.

FYI: If you are using Spotify, just change the volume with the Spotify mediaplayer. It uses the same logic of volume management.

Sadly setting the exposed group of the Plugin to a volume will instantly set all entities in the Group to this same Volume Level. But as far as i know, this is inline with how Echo works in the App.