 Additionally, it offers two "polyphonic" play modes, two "unison", and two "solo" modes, one of which stacks all its oscillators into a single monophonic sound.Further, the synth's MIDI specification is surprisingly polished for an instrument of this vintage (unlike most earlier Roland synths, and even its direct successor, JX-10).Programming is achieved either by means of one "edit" slider and a table of parameters for selection by number input, or by means of a separate unit, the Roland PG-800 programmer.