So if i want a Kick tune in D, i will just turn the tune on +2, isn't it ? on each 4 oscillators if i use them ?
That would depend on whether the percussion sample in question is tonal or atonal; the latter of which, by definition, would have no center pitch, so tuning it would be a subjective exercise at best. But for the VS waves, samples 368 through 464, yes, a setting of +2 would most definitely be a D. And with the analog oscillators, there should be no confusion, because they
tell you what note they're tuned to. Which brings me to the self-help-tip-of-the-day:
You know, kids, in the olden days, we musicians used to tune things by ear (!). I know, I know... It's a scary concept, having to rely on one's own musical sensibilities like pitch and meter - unfathomable some would say - but I promise you, it can be done. What I'm saying is, when in doubt, you could always tune your samples to the analog oscillators or any of the tonal elements in the track you're working on. In fact, I recommend it. It's very liberating (wink).
Cheers!