Kompulsion is a Player Rack Extension for Propellerhead Reason. It has two major modes of operation. The first mode is the traditional matrix-style sequencer with selectable key and scale. The second mode is the arpeggiator, which uses incoming notes to fill out the scale. Each row in the matrix (S1-S16) acts as its own mini monophonic sequencer. The best parts of Korde and Propulsion are now merged into the Kompulsion Player.