Were you using a MIDI to SMPTE converter of some kind? The MPC 1000 only has MIDI I/O, no SMPTE tape sync. And the stock firmware only offered regular MIDI clock, not even MTC[1], though it is possible to get MTC in and out of an MPC 1000 using the unofficial JJOS OS[2].
You're holding it wrong. You can just record a real one and play it back. I use the same cursed approach with my 2500XL to intake/chop/modify/output cv/note signals to a modular setup (which has a handful of outs that don't need to be modified to do this)
