This is an article culled from archive material, circa 1997.
The Matrix-6R is the 3U rackmount version of the Matrix-6
keyboard. It is a six-voice, bitimbral analogue (DCO, VCF)
unit with an extensive modulation matrix.I basically consider the Matrix-6 and 6R to be lower-quality
cousins of the Xpander and Matrix-12. In particular,
on my unit the tuning was rather rough, as was the filtering.
This is not necessarily a bad thing, and the machine can make
some startling sounds, but I didn't consider the tolerances fine
enough. The Xpander is a higher-quality machine, but since I
personally don't like the Oberheim sound much, I've never
seriously considered buying one.The Matrix-1000 is a single rackspace version of the Matrix-6R.
It is monotimbral only, with a single mono audio out. (The 6R has a
mono out for each of the two tones.) The '1000 cannot be programmed from
the front panel; instead, it is generally considered a preset machine,
with 800 ROM patches (good ones, I am told) and 200 RAM patches which
can be reprogrammed.