Just thought I'd let people know that Ian Luck has finally put out an unofficial UNIVERSAL version of BASSMOD, landing at just under 145kb, as an alternative to the huge FMOD libraries.
There is some endianess issue in some trivial macro/function according to a user in the un4seen.com forums, but the lib works perfect as far as I've tested.
Grab it here: http://www.un4seen.com/stuff/bassmod-os