YAMAHA DX7 SYNTH W/ GREY MATTER MOD

via this auction

"IT FEATURES THE "GREY MATTER MOD" WHICH ALLOWS YOU TO STORE 576 PATCHES!! APPARENTLY THESE GREY MATTER BOARDS ARE NO LONGER AVAILABLE, SO HERE IS YOUR CHANCE TO GET THE BEST OUT OF THE FAMOUS DX7!!"

KORG MS20 with Original Box

via this auction

SEQUENTIAL CIRCUITS PRO-ONE

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Sequential Circuits SIX-TRAK

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Novation Bass Station Keyboard

via this auction
"Features:
2 digitally-controlled analog oscillators (DCO) with saw/pulse waves
1 voltage-controlled analog filter with selectable 12dB/24dB slopes
2 digitally-controlled envelopes (one for filter/pitch, one for VCA)
1 digitally-controlled low frequency oscillator w/random, saw & triangle waves
key transpose, pitch/mod wheels, MIDI in/out, 7 RAM memory slots, etc."