A typical PeZ question

i use SDL_mixer to play modules…
if i play the first song the volume seems to be ok…
BUT if i fade out the first song and fade in the second,
the second one has a lesser volume-level…
HMMM…

Is this my fault ???

Best regards
PeZ

btw is there a way to let the sound-output running during a
task-change…(background music)