Korg Poly 61 w/ MIDI upgrade & realtime mods for the Filter and Envelope

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via this auction

"This Korg Poly 61 has been completely overhauled and upgraded
In good cosmetic condition, the back/bottom corners are a little banged up

• All key contacts have been reconditioned and work 100%
• Battery has been replaced
• Factory patches have been uploaded

UPGRADES:

• MIDI In & MIDI Thru (Both use Channel 6)

• Realtime knob control over the Cutoff, Resonance, Attack, Decay, Sustain, & Release

The Korg Poly 61 is an amazing sounding synthesizer, great for those woozy BOC style pads, as well as basses, and unusual sounds that you can't quite get on a Roland.
With this unit, you won't have to worry about all of the common issues the Poly 61 is known for (leaky battery, bad keys, etc)."