The Mellotron M4000D is a digital recreation of the extremely popular and sought after Mellotron keyboard that was originally released in the 1960's. The Mellotron M 4000 D is a 24 bit digital uncompressed audio playback unit which features 100 Mellotron and Chamberlin sounds built in. If the built in sounds aren't enough there is a cartridge slot which let's you add 100 more sounds for each cartridge.

The M4000D's keyboard is of a wooden construction and has depth sensitivity and polyphonic aftertouch out via MIDI. Two TFT-displays are on the front panel user interface and are capable of showing pictures of the actual instrument that the Mellotron is recreating.