Volumio issues with HA and google home

I use volumio for music playback in a couple of rooms and after I enabled autodiscovery in HA, I can control it’s basic functions in HS (play, pause, next,…). This part is mostly fine, except for the following:

  • each instance is detected twice, as already mentioned here:
    Volumio nodes duplicated in Lovelace front-end?
  • I don’t know how to use it for TTS.
  • I use googe home integration and volumio is being detected as a switch and even the on/off functionality offered (for a switch) does not work.
    Any advice appreciated.