There's a couple of 'tracker' progs around (see
this thread). As for the whole 'Cool Edit Pro' thing...well, there's a few basic sample editors, and there's a project called
GLAME which aims at becoming the Linux sound equiavalent of Gimp.
There's also something called
Psycle, which is open software, but only for Windows at the moment. If you're into cross-compiling for different platforms and you want a challenge...