This one also has a rare "Pan Shape" control knob mod (instead of the usual "image offset" which was just a simple panpot like a mixer has ie useless). Pan Shape varies the wave shape of the panning/tremolo from sine wave to square wave and everywhere in between, for extra versatile sound shaping, able to get more depth and width for harder more extreme sounding panning, and everywhere between smooth sine and hard square... Makes it so much more versatile than all other panscans which were set for only smooth sinewave. The Pan Shape control is usually only an internal stock factory setting, now made external via knob for far more range in panning shapes and sounds. The circuitry is still all original, just made adjustable on an external knob.
I found a video of someone's usual stock unit with sine wave only you can see at. This one does that and goes far beyond it to square to all points in between sine and square. These units can also do triggered panning with various related features, all described in the pdf manual you can find at. The item "ADR Panscan rare 80s true stereo panner / tremolo / vibrato vintage analog" is in sale since Thursday, March 4, 2021. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Effects Pedals\Filter & Modulation".
The seller is "topgearmusic" and is located in Milwaukee, Wisconsin. This item can be shipped to United States.