Twin Player STC-50 is a DJ tool that's prefect for those with large music libraries in MP3 format. Unlike many other controllers in its price class STC-50 grants you the freedom to decide whether you access your MP3 collection via USB or SD storage media. The tracks here can be manipulated in many ways and as with a conventional double CD player all the usual functions are available with loop function, pitch and cue as standard. Creative functions include reverse and brake functions as well as scratch functionality which can be controlled through the well-balanced jog wheels.