Yep - that's what the "computer interface" is - the same sort of interface that goes all the way back to an upgrade to the first Emulator. It initially was the RS232, RS422 then the RS422 augmented with the more widely-used SCSI port. I'd used it a few times in conjunction with the E-II+HD and Mac Plus running SD and Turbo Synth - at the time (1988), it really was (apart from the internal sequencer) almost like having a Fairlight or Waveterm/Wave system with all the editing and synthesis widgets it provided.
The Emax II can use that interface - you'll just need an older Mac, the special cable and a copy of one of those apps. I think the Emulator Archive might have this for download, but I'm not sure.
“I have stretched ropes from steeple to steeple; garlands from window to window; golden chains from star to star, and I dance.” - Rimbaud