DR220 or Rhythm doctor is a rhythm box. It possesses 16 stereo channels and can play 24 beats in a tempo. Each channel can be controled, for instance, by setting its own volume, or by setting the tone. The software has 255 models of preregistered sounds and 255 tempos. Once your composition is ready, you can save it on your PC. Be aware, the backup needs a preliminary installation of DirectX.