Original recordings produced on Conlon Nancarrow's modified Ampico reproducing player pianos and recorded under his supervision. Recorded in the composer's studio in Mexico City, April 1977. Produced in M-S stereo using a Neumann SM69 microphone and recorded with Dolby process.
Remasters: 24-bit analog-to-digital transfers from the original Dolby A. masters on loan from the Paul Sacher Foundation (Basel). Barcode: 6 84390 10122 8 Matrix / Runout: SD5851-1 PT/GP/CA 23809 803573 (Disc 1) Matrix / Runout: SD5851-2 PT/GP/CA 23810 803574 (Disc 2) Matrix / Runout: SD 5851-3 PT/GP/CA 23811 803576 (Disc 3) Matrix / Runout: SD5851-4 PT/GP/CA 23812 803577 (Disc 4)