Roland Planet-P MKS-10 80's Vintage Rack Mount 2U Polyphonic Piano Module - 100VRoland Planet P MKS 10 80's Vintage Rack Mount 2U Polyphonic Piano Module 100V The MKS 10 Planet P is a 16 voice polyphonic piano sound module with MIDI, released in 1984 by Roland. It has just eight preset sounds: two Piano sounds, two Clavi sounds, two Harpsichord sounds, and two Electric Piano sounds. Condition: This unit has been used. This MKS 10 shows some general wear from use and age. Nothing which detracts from the use or sound of the unit.