The Ensoniq EXP series of expansion boards is compatible with the MR-61, MR-76, MR-Rack, ZR-76 (which can take 3 cards) and ASR-X (which can take 1). They contain from 2MB to 24MB of sounds.
The following cards were produced:
The EXP-2 is not necessary in the MR keyboards. It was meant to add the missing drum sounds from those into the MR-Rack.
The EXP-4 board is built into the Ensoniq ZR-76.
In addition, the MRC-1 "Synth Banks" ROM sound card containing 180 sounds was available for use in the MR series card slot ($99.95 list).
ENSONIQ EXP-1 THE REAL WORLD EXPANDER MR-Rack, MR-61, MR-76, ASR-X Pro, ZR-76 ($330)
E-MU ENSONIQ EXP-2 MR-RACK DRUM EXPANDER ($240)
Ensoniq ASR-X Pro with EXP-3 Board, Maxed RAM and More ($1,400)
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