Kurzweil K1000PX to PRO-1 Rom Upgrade Set
The PX version comes with 6 Sound eproms [U50,U51,U54,U55,U58,U59]. To upgrade to PRO-1, you need the PXA upgrade [U52,U56,U60], the PXB upgrade [U53,U57,U61], as well as the 4 OS chips [U21, U22, U32, U33].
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Please be aware shipping times are estimates only, NOT a guarantee of delivery time. All carriers still seem to be having occasional issues.