The Juno 2012 is two Roland Juno 106′s in a custom case giving the Juno 2 parallel oscillators, LFO’s Envelopes and filters per voice, Front panel fine-tuning for each synth provided and then running through parallel filters with a cross fading mix control. One runs as a master synthesizer and one as a slave you can edit both from the master panel or with the different setting of the rear function switch you can edit separate patches on each. these both run through the same chorus and jack board for a full stereo mix out at the rear and you can set each to a different midi channel for multi timbrel control. Also added is polyphonic filter frequency modulation of the master synthesizer’s filters using the slaves synthesizers voices as mixable modulation sources. This pushes the sound creation potabilities of the Juno-2012 far beyond its original design
Looks so much fun. Excellent use of a Roland Juno with a bad keyboard. 
106 10 6 10 x 2 = 20 6×2 = 12