Roland MKS-70 Super JX Synthesizer

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SN 783673 via this auction

"SERIAL NUMBER: 783673
MANUFACTURED: May 1987 (Online Roland Serial Number Check - 2nd year of production!)
ROM VERSION: 1.04 (Important bugs fixed, needs only 1 chip not 3 if you wish to upgrade!)

This was one of the flagships of the Roland mid 80s synths, 24 DCOs total that can be used as either 2 (Dual) layers as a 6 note 4 osc synth or as a single layer (whole) 12 note polyphonic. In 12 note mode it's particularly useful for long release pads and strings as you won't run out of notes when you change chords (unlike the JX-8P which is restricted to 6 notes maximum). Layering it up in 6 note poly mode provides for some very rich sounds that can be output in various ways using the jacks on the back for expansive stereo.

You can play/audition the sounds on the synth by pressing 'enter' + 'shift' as this turns the number keys into a mini keyboard, octave can be changed with the arrow keys. Quite handy if you want to program it away from your keyboards.

Note: This unit has v 1.04 ROMS on both sound boards and assigner Board. This means it has many of the most important bug fixes and improvements already in place but you can upgrade further or even swap in custom chips that add some very cool new features (Details can be given if you are unaware of where/how). There is even a mod on the way that could possibly add PWM along with 2 extra (faster) envelopes, better MIDI spec and some other great additions. As it has 1.04 ROMS I believe if you wish to upgrade to the latest Firnware you'll only need to swap the Assigner board ROM not all 3 (Don't quote me on that though)."