Vortex Sound Research

I'm looking to sample my KORG M1 and some expansion cards and wondering since it's a ROMpler is there any point to doing multiple samples of notes up and down the scale? Or could I just sample one note and have the software sampler do the pitching? AFAIK the Korg doesn't have multiple samples at different pitches, it just uses its own hardware to shift the pitch? I would do a clean sample of just the oscillator with no LFO or ENV or effects, and do that in software after.

The next question would be which pitch would the original sample be at? Middle C? A? or different for every sound? How would you determine the original pitch?