ARPocalypse is a free studio tools VST plugin developed by Wiz. Compatible OS(s): Windows 64b.
ARPocalypse is a 6 note, 8 step matrix pattern generator. Taking a MIDI input it outputs the notes of the chord in a rhythmic sequence defined by the user – with the output notes, velocity, gate time, swing and legato programmable for each step.
http://www.wiz.nildram.co.uk/ARPocalypse/