Well from all three. I know the claps you are talking about owning, and the claps from the neptunes, or even dre and such. The claps you have are probably synthetic 808, 909, such claps from a keyboards replication. The claps you want, a good portion of them, you can get from R&B sample cd's. I have "OFF THE HOOK 1&2" from Big fish, and it has ALOT of excellent quality snaps (fingers), and claps (hands). If you have leave an email Ill send u a couple.
2. The recording of drums (especially with neptunes) is with samples, and live drums. Neptune tracks, with the sound youre talking about have a sampled snare, a sampled snap... and they also have a real life snap played, and recorded live at the same time,on top of the samples. That gives it a live feel. If you listen to those neptune tracks, you can tell that the down beat of the snares sound different everytime....This is done with the live feel of snaps on top of the sampled drums.
whereas if you quantized only samples, you would get a mechanical feel like when you heard producers who first start developing their skills.
Another track from Neptunes with the CLIPSE, "GRINDIN" used all the drums from the Trinity rack. Ive even heard a couple new R&B tracks that are using the old Trinity Rack drum sets. You have to also keep in mind, producers like the neptunes, dre, and such also have alot of outboard gear for their music. Its not like they just patch an mpc through the mixer and record it live. All the sounds are compressed (which has a HUGE effect) on drum sounds, eq'd, gated....everything. So, you have to realize you wont get the "same exact" sound as the neptunes or such...
Compression isHUGE to producing