Vintage Synth Say : The oberheim matrix 1000 is a cheap version of a matrix 6 with a huge and warm sound.
They also say : The analog Matrix 1000 is essentially 1,000 Matrix 6 patches in a single-space compact rackmount MIDI module. It has the same synth architecture as the Matrix 6. Each of its 6 voices have two DCO's (digitally controlled analog oscillator), a low pass filter, 2 VCA's, 3 envelope gens, 2 LFO's, and 2 ramp gens.
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Here is a YouTube demo.