AP GSP-1 Rackmount Panpot Synth Mixer?

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Description doesn't say what this is. It appears to be a panning mixer, but for what? If anyone knows what this is, feel free to comment.

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Mokira / Tilliander - Dröndjävul #4

YouTube via repeatle | August 18, 2010

"Sometimes I/people wonder if I need all those delays in the studio. This was merely an attempt to use most of them (62%?) in one recording.
Some people like fast cars, I like slow delays.

Hard delays used in this recording:

Roland RE-201
Roland RE-301
Roland Re-501
Korg SDD-1200
Dynacord SRS-56
Aria AD-15 Locobox
AP S-303
TC Electronics D-Two
Ensoniq DP/2

The main sounds come from four loops in Ableton Live.
The rest is Korg Mono/Poly, Stylophone and beer."