Maestro USS-1 guitar synthesizer system

via this auction

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via the seller: "Maestro USS-1 guitar synthesizer system. I bought it in the mid-1970s from Apex Music in San Diego (wonder where they went?). Reputedly designed by Oberheim for Maestro/Gibson. A real monster of an effects unit, way before the modular flexibility of Boss, Roland, Electro-Harmonix, etc. I used it on several records in the late 1970s-early 1980s at which time it go pre-empted by rack gear (all of which now thankfully is gone). It's been sitting around in the closet basically ever since. Cosmetically it is in EXC- condition as depicted with a few light scratches top bottom front back sides. As was the fashion of the time I engraved my name, social security number and driver's license number on the back lower left side - way before the concept of "identity theft" even was developed!. So now I scraped it off. Electronically the sample & hold works great and is extremely psychedelic; and the phase works OK. The waveform, which is a primitive fuzz control, only barely adds anything to the sound. And I can't get the envelope or the subharmonic (octave lower) to work at all. No pedals. So it is sold "as is" with these caveats as to condition, your tech most likely will be able to get them going without too much problem."