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-3 URBAN DANCE PROJECT MR-Rack/61/76 ASR-X Pro ZR-76 ($330)
Ensoniq EXP-3 Urban Dance Project Expansion Board for MR61 MR76 MR-Rack 1990s ($349.99)
Ensoniq EXP-1 ($282.79)
Ensoniq EXP-1 The Real World Expansion Board for MR-Rack MR61 MR76 1990s ($329.99)
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