Full Compass Systems - Aphex USB 500 Rack – USB 2.0 Audio Interface for 500 Series Rack Mount By combining a 500 series rack and a USB 2.0 audio interface into one
Aphex USB 500 Rack USB Audio Interface w/ THREE Aphex 500 modules | #1835081160
Aphex USB 500 Rack Audio Interface Overview - Sweetwater at Winter NAMM 2013 - YouTube