I was looking at some convenient USB to 1/4 cables. Or even a Firewire to 1/4 if it exists. I don't want to buy a cable with high-impedance so I can plug my guitar into my Macbook Pro. I have a regular quality audio interface already, but want this for convenience and portability. I was looking at the Alesis GuitarLink and it seems pretty good, though I saw the 2nd review here mentions the bad impedance: http://www.musiciansfriend.com/pro-audio/alesis-guitarlink-usb-audio-interface-cable#review Anyone recommend a good quality cable?