The BU-4500 CD/MP3 Drive Unit can be used in conjunction with the DN-HD2500 Media Player/Controller and the DN-HC4500 USB MIDI/Audio Interface and Controller.  In addition, it can be used as a replacement drive for the DN-D4500 CD/MP3 player.

Compatible with Key Adjust / Master Tempo (CD or MP3)
MP3 Hot Starts and Seamless Looping Capability
Cue Stutter (CD or MP3)
CD Text and ID3 Tag Support
Auto BPM Counting
Wider Pitch Ranges (CD+24 / 50 / 100%)
Fader Start Compatible
CD / MP3 Drive unit compatibility with DN-HC5000
CD / MP3 Drive unit compatibility with DN-HC4500
CD / MP3 Drive unit compatibility with DN-HD2500