This MPX-100 functions, has the power supply, but has some issues. As you can see, the main knob broke off, and I couldn't get it to turn, so I super-glued a thin piece of metal onto the shaft so I could get it to turn. Also, a couple of the buttons on the front (bypass, store, and tap) are sticky.

Anyone who's into electronics could probably take the front off, replace the shaft, get a new knob, and fix everything so it's back to 100%.

The Lexicon model MPX-100 is a dual channel processor, a 1U-high, dual-channel stereo digital effects processor powered by an internal Lexichip. Comes with power supply, which wasn't cheap ($30).

Processing & Audio Quality:

Internal Processing: 24-bit

A/D – D/A Conversion: 20-bit

Sample Rate: 44.1 kHz

Frequency Response: 20 Hz – 20 kHz (±1 dB, wet/dry)

THD+N: < 0.05% (20 Hz – 20 kHz)

Dynamic Range: > 95 dB typical (A-A, unweighted); > 100 dB typical (A-D, unweighted via S/PDIF)

Crosstalk: > 45 dB

Presets: 240 total presets (classic stereo reverbs like Ambience, Plate, Chamber, and Inverse, plus Tremolo, Rotary, Chorus, Flange, Pitch, Detune, 5.7-second Delay, and Echo)