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"For sale is a fully restored ARP Odyssey Model 2800. This unit has the original ARP 4023 filter, which despite what you may read online, is not the Moog filter (ARP 4034, 4035). This unit has been restored by us and we have added some extra features such as a flexible aftertouch system, external audio input to the filter, and a single/dual trigger switch for the ADSR. (For legato playing. 
Same way Minimoog works.) The single dual trigger switch is located above the noise generator switch. This mod also disables retriggering of the LFO (LFO Free Run) The unit had been modified by a previous owner. These mods were all removed, and the holes drilled for the old mods were capped with the same style caps as used by ARP. This unit plays beautifully and is amazingly expressive with the aftertouch module. The aftertouch module contains its own triangle/square LFO, the rate and amplitude of which, can be controlled by aftertouch sensors underneath the keys. The aftertouch voltage, and the LFO signal can be routed to VCO1, VCO2, VCF, and the VCA in any way using the front panel controls. We have also added a switch on the left side of the keyboard that allows the sample and hold clock speed to be modulated with aftertouch. 
Below is a full list of the electronics work done:
Keyboard bus bars replaced
Rubber key bushings replaced
Aftertouch sensor added to keybed
Aftertouch electronics added to panel
Switch that routes Aftertouch LFO to S&H clock added
ADSR and LFO Single/Multi Trigger mod added
Original power supply replaced with modern Power One linear PSU
All sliders removed, disassembled, tested, cleaned/polished, rebuilt. All bad carbon traces replaced. (This is important!)
All opamps, CMOS 4011 ICs replaced
All polarized capacitors replaced
Both VCOs completely rebuilt
Decoupling caps added to reduce bleed from VCOs and S&H mixer on oscillator board
All remaining electronics issues addressed, unit tuned, calibrated, 100% working.
Old power cord replaced
Aux Filter Input jack added"
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