Amazon.com: Apogee Duet 3-2 Channel USB Audio Interface for Recording Mics, Guitars, Keyboards on MAC and PC - Great for Recording, Streaming, and Podcasting, Runs Apogee DSP Plugin : Musical Instruments
Focusrite Scarlett 2i2 2-Channel USB Audio Interface | Electric Violin Shop
PreSonus AudioBox iTwo USB Audio Interface for Mac / PC / iPad | Reverb
What is Audio Loop-back and how to use it? - Audient