Volume of speech is wrong relative to the volume of music

[gcampax]

There are two related issues here:

• The volume of the speech is generally very low even if the volume of music is acceptable.
• The music is not stopped or lowered when the agent is speaking.

In theory, the latter vould be accomplished with pactl load-module module-role-ducking ducking_roles=voice-assistant volume=20%, but this has no effect because the music is playing from an ALSA-to-PulseAudio stream that lacks the requisite role (should be "music" or "video").

This issue occurs on Home Assistant OS, using the add-on.

[gcampax]

Turns out one can set the Spotify volume from inside the Spotify app, including for the spotifyd client, without affecting the PulseAudio volume, so this is less pressing of an issue.

[gcampax]

For the ducking bit, we might be able to force spotifyd to have the right role if we run with PULSE_PROP=media.role=music in the environment. Then loading the module should be enough to duck it.