For those that have been following my problem, the answer for CD Music Prefs setup on the A4000T with AsimCD installed and a SCSI CD-Rom was to use:
Device: scsi.device
Unit: 5 (the SCSI ID)
For whatever reason there is no icon for SCSI.device in my Devs folder and it was only when I looked at the setup file for Exodus: The Last War that I saw the correct setup! It's a bit confusing how all this CD.device stuff works! However, solving it now means I have music on Napalm and Heart of the Alien as well as Exodus. I knew it would be worth buying Exodus even though my CD-Rom doesn't like the disc too much the auto-setup features are obviously quite advanced for an Amiga game and helped me solve this problem!
All in all Another World 2 is a good game with good music but I'm getting phantom game input commands registering every so often. I don't know whether the inputs are double buffered or not but when the alien jumps when I haven't pushed anything it's leading to a lot more deaths than I'd like! Any ideas? This is on a 060 so it should be fast enough to have no input lag!