German Modular Dimmer System
There were 3 versions - the original ANDI dimmer, then ANDI LX, and finally ANDI DX (1994).
ANDI: +/- 10V control input. Developed and built by Hesch/Neustadt in Rübenberg
ANDI LX: +/- 10V control input. Built by a company in Cremlingen/Schandelah
ANDI DX (1994): Digital dimmer with Strand LD90 central processor, from the above company.