Don Blake wrote:yeah i got most of that man but i for some reason seemed to think that i could use 4 samples of different nots to make a more acurate sound, is this correct?
You're getting in the right direction!
Keygroup means, a sample depends to a specified range of keys and it is tuned chromatically (or has it's own specified or fixed tuning) in this range of keys.
The basic use of keygroups is, you can record a sample of an instrument and put it into a range of keys, and then take another sample of this (or another) instrument, and put it to a following range of keys. So the overall sound sounds much better than you would play one single sample over all keys.
For best results, a keygroup can be done on every single note (the term "group" seems a bit misleading then). This means every note has its own sample (and every layer on this note could have up to 4 different samples for velocity expressions). If you don't want to invest so much work, you can choose other keygroup ranges, maybe octaves, then you can have after every octave another sampled sound... however where you want to put the samples...