M & S Systems DMC1CD Add-on 6-disc CD Changer for DMC1 / DMC3-4 (Discontinued by Manufacturer) This is a multi-disc Compact Disc player that connects to the DMC1 or DMC3-4 Music/Communications systems for a CD audio source input. The CD changer mounts below the master unit and contains a slide in CD magazine that can hold up to 6 Compact Discs. The DMC1 and DMC3-4 master unit display shows the disc number selected and the track number currently playing. The display can also show the total number of tracks on the current CD and the track of playing time. Next Disc, Previous Track, Play/Pause, and Next Track pushbuttons control the changer while playing.