Can I plug my guitar (or fill in the blank) into FourTrack?
Yes, you just need an adapter. We recommend GuitarJack for the best results. GuitarJack connects a wide range of instruments, microphones, and other audio hardware to the iPod touch (2nd and 3rd generation), iPhone 3GS and iPhone 3G via 1/4 inch instrument and 1/8 inch stereo mic/line inputs. GuitarJack makes both level control and input monitoring possible when using a GuitarJack enhanced app. GuitarJack also makes stereo recording possible in FourTrack. Comparison Chart of Audio Accessories for iOS Devices There are also adapters available that break the headset jack out to two mini-jacks, one stereo output for headphones and one mono input for a mic. These are hard to find, but you could plug a guitar into one of these using a 1/4″ to mini adapter. There are also cables available that can be purchased for the iPod that break out the mini jack to three RCA jacks. These are designed to let you connect the video signal of an iPod to a TV. On the iPhone and iPod touch (2nd and 3rd gen.)