Hello,
In the game options, the music volume slider acts as a master volume. Lowering, raising it or muting it affects both music and SFX volume levels. The SFX slider only affects the SFX volume.
I'm using the latest build (0.9 git 2013-10-16 14:11), but it also happened on a previous build and on the "stable" version.
What could be causing this? Is it a general bug or is it just me?
Thanks in advance.