Re: how to install the AIFF files to use them in logic...
Check out this following articles on building up EXS24 sample instruments
Also if you want to get more advanced with the sampler, definitely check out the tutorial by David Dvorin:
This is explains the ins and outs of the EXS24 sampler.
A few tips I can help with though, is make sure you drag the note (B5) onto the B5 on the keyboard in the EXS24 editor. Make sure [b]Pitch[/b] is ticked. And then increase the Lo and Hi range under [b]Key Range[/b]. You will see how the note expands over the keyboard. Or you can simply hover over the sides of the note on the keyboard and drag either to the right or left to expand its range.