I'll be probably using just music, haven't found any suitable free sound effects. I've wanted to have music played and after a level finished, turn it down a bit while shopping and then up again, fade in/out. Looks like I'll have to use just pause/play or continuous play.
Is it same problem for you? Have you tried it? I'd upload an example, but I'm not on my comp and I can't get to my dropbox account(forgot pass).
+ System: Start of layout -> XAudio2: Play music "guilty.mid"
-> XAudio2: Set music volume to 100
+ MouseKeyboard: On any key pressed -> XAudio2: Set music volume to 80
This is first time I'm using sounds, but when I replace the mid with mp3 it works.
Edit:
Here is the file