via this auction
"Includes the (somewhat rare but extremely useful) Grey Matter expansion board installed. It is version 1.20.
Some of the features of the Grey Matter expansion:
# extra patch memory (with function data for EACH patch)
# patch mapping
# master contoller functions
# transmission on two midi channels
# stacking of sound (makes it thicker but only 8 note poly)
# 8 voice multi-timbral capability# a sequencer
# a MIDI monitor
# a simple, "interactive" player mode"
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