thanks, but i'm using wing95 version
What you can do, is changing the .ogg files' volume (for example with the freeware 'audacity'), but this is not really handy and it breaks the doxbox-version. For the dosboy version it is necessary (at least in version 188.8.131.52)
to add MIXER CDAUDIO 50:50 (50% volume) to the line that starts imgmount. in the file 'dosboxCARMA_single.conf' .