My headphone jack for my sister's MacBook is stuck on the optical setting, and it's pretty much considered busted by Apple. Rather than fork out for a logic board repair, I was wondering if anyone knew of a cheap external soundcard that she could carry around? Being a musician, I love my Apogee Duet 2, but their products are overkill for what she needs. A simple 3.5mm jack output would be perfect. Thanks!