Some of the most famous records were recorded on a four track recorder, including the Beatles and the Rolling Stones. Four tracks were given to make legendary albums. Electro Harmonix brought that technology to a small digital format that can be used on the fly. Each loop has 4 mono tracks and one stereo mix down track that records non-compressed 44.1hz / 16-bit CD quality audio that can be stored on a SD card. There is real time loop manipulation that includes up to two octaves down and a reverse function. For extra capabilities there is a built in metronome that can send to a monitor out as well as a headphone out. For even extra ease of use you can control the 45000 with a foot controller that is sold separately, which helps recall stored loops and makes it easier to record and overdub with a tap of a foot.