I currently record with a microphone and Audacity. I also have Cool Edit Pro. I'd like to be able to record voice, electric guitar, classical guitar, bass guitar, keyboard, piano, double (string) bass and trumpet at a decent quality (not all at the same time, though maybe 3 or 4 simultaneously). I want to be able to do multitracking effectively. What do I need to buy? A preamp? Do I need better editing software? I don't mind spending up to about £200 ($350). Also, how much would I have to spend before I'd be approaching commercially-produced CD quality? Thanks.