Thanks all for the input. I should have explicitly stated that I already bought the PX-7, even with the cleared user data. Since I know Emu rack-mount synths well, I knew about the user banks of synth presets, but not the pattern data. I do see the PX-7 patterns file available in the Files section and I will definitely download it (as well as install/configure ELoader).
Followup question: if they're just MIDI files, can I also use ELoader to load the factory patterns from XL-7 or MP-7 without having the XL-7 or MP-7 ROM? This is more out of curiosity, because I actually do have the X-Lead v2 ROM and the MK-6 ROM in my Proteus 2000.