The front panel user interface has 2 high-quality TFT displays which display pictures of the actual instruments being played. Any two sounds (A & B) can be played and blended using the MIX knob. There is a High-Low switch for playing in Normal or Half-Speed play. 

• 100 instantly accessible authentic Mellotron & Chamberlin sounds
• 24-bit uncompressed digital audio derived from the original master tapes
• 1/4" inputs for: Sustain Pedal, Expression Pedal 1 & 2, and Volume Pedal
• 1/4" Headphone output
• 1/4" Line outputs (A Direct, B Direct, and Master)
• MIDI in/out/thru
• MIX knob for blending any two sounds together
• PITCH knob for adjusting the pitch up or down
• High-Low switch for Normal or Half-Speed play
• Dimensions: 31.75" width x 13" depth x 3" height

Demo of M4000D (MINI has the same user panel and sounds)