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"This Arp Omni 2 was recently serviced and all the tantalum caps replaced by Bay-Area pro tech Chris Hewitt. (Who sent the photos of the inside of the board).
It sounds amazing. It has the famous Arp string sounds used by Joy Division, New Order, Tangerine Dream, Kraftwerk, the Cars, etc. There are a couple of really deep chorus settings "Hollow Wave" and "Chorus Phaser" that make this synth famous.

It also has incredible Bass sounds- really LOUD, punchy and warm.
The synthesizer settings allow for creating very musical, spacey sounds, especially using the resonant VCF and the LFO. Also cool is the separate outputs for "Strings," "Synth," and "Bass" in addition to the main "mixed" output. This way, you can process each part through different effects, and send them to different amps. Really cool feature, especially for live playing.
Some notes about the condition of this synth: I am not a tech, but the synth appears to function as designed. The keys play well and are in good shape. They are not perfectly even, and some show minor wear and tear- a scratch here, a mark there. ALL of the voice settings work and sound great. The highest key does not produce sound. Some slider caps are missing.
This is a beautiful old synth."
Pics of the inside below.