Ugh. The music volume is not respected when a new track starts. I have to go to preferences and change it again.
What was happening was I changed the music volume to what I wanted it to be at (about 13), then when the track changed it would start playing at the default volume (50). I had to go back and change the volume slightly to get it playing at the correct volume again. This happened a few times. Weirdly I can't reproduce it anymore. Maybe it only happens on first run?