Tascam's GT-R1 is a solid state, portable recording interface compatible with guitars and basses. It features built-in stereo condenser microphones and input jacks for patch cords. The GT-R1 hosts a rhythm machine and overdub mode for step-by-step song recording in MP3 or WAV format (16 or 24-bit quality). The recording interface comes with a 1GB SD card and a USB 2.0 jack for charging and file copying (to PC or Mac computers). It holds a low-cut filter and analog limiter to combat distortion as well the ability to load and loop MP3s and slow their tempo or cancel guitar or bass for song-learning.