Well, I’ve just performed a velocity test playing a standard MIDI set of congas. When I laid back, almost none of my velocities were under 90. When I played more aggressively, I peaked the meter at 127 numerous times. My digital piano has three velocity curves and these were the results for the most aggressive curve (have to hit it the hardest to peak the values).
I’m thinking this: I’ll listen to each of the sample sets and decide which is the first usable sample in terms of general loudness, and put that at 85. Then I’ll evenly divide up the remaining samples between the remaining values up to 127.