According to the help files they are supported, now I can get midi files to work and I am using the music0 music1….listings any Ideas?
There's a little inconcistency in the manual... http://www.adventuregamestudio.co.uk/yabb/index.php?topic=17637.0
Convert you'r background music files to .ogg, saves space and nerves. ;)
http://www.vorbis.com
(appears to be down atm, but here's something aswell: http://www.xiph.org/ogg/vorbis/)