After going into Settings/Audio and setting Music volume to 0%, the music is muted as expected.
When I turn off my headphones and my laptop switches to its internal speakers, the music begins playing again.
Opening the Settings/Audio menu shows it still at 0%. Moving the slider up and back to 0% mutes the music again as expected.
Music should stay muted when changing audio devices.
I could not reproduce this issue while switching from my headset to my speakers in v0.4.9c
I've experienced jweather's issue on occasion, as I also keep my music set to 0% most of the time. The problem doesn't occur consistently for me. However, I encounter much more frequently a somewhat different issue which may be related: often when my laptop goes to sleep while COI is running (which disconnects my USB headset while sleeping) COI will stop playing any audio regardless of the audio device chosen. Changing audio devices doesn't fix this but dragging up the music slider and dragging it back to 0% does inconsistently. More often though, I have to restart COI.
