My son is a musician and we have used a Direct Mix USB in the past to get his guitar into the Mac. We recently bought a Tascam US 122, thinking the included software would work with OS X. Drivers were there for X, but Cubasis only works in 9 so we brought it back. Along comes GB, which I think will perfect for him (he's 15) since he is good at iMovie/DVD, etc, and uses an iPod exclusivly for his music. My question is: which USB input device should I buy to go along with GB? He would want to get his guitars, bass, and his Yamaha stage piano into GB to create songs. He would also use a mic at times for vocals, or to mic his instruments. I dont know if I should re-purchase the Tascam US 122, M-Audio MobilePre USB Audio Interface, Edirol UA-20 Digital Audio Interface, etc. The Tascam has midi input/output- but I dont know if he needs that for use with GB. Like I said he has a keyboard- but it is not midi- it's a real stage piano with weighted keys. I don't know much about midi, or what he would do with it in GB- any suggestions would be GREATLY appreciated!!