OK started but falling at 1st hurdle

ALRIGHT BUDDY.... sorry to hear your still not sorted with course files

as to your other query.... i may be wrong(carnt remember that bit).... but when you shorten a clip on the drum sample from 1 bar to half you are doubling the rate in relation to your global tempo

so over a period of 1 bar which would normally be a 4/4 if you had for argument sake a kick sample 1 whole note (1bar long) and you shorten the sample by half... this would result in having 2 half notes (or 2 beats per bar)

if you shortened it again to quarter notes you would have 4

ohhhhhh I think that is time stretching....... are transient markers mentioned???? 

also know as warping....

so you can move those markers left or right to give the clip a fixed timing so if you drag the end marker to half length. that should do the trick
so you can have a bit of fun with any sample.... stretch or compress the wave form altering time an pitch.... much like speeding up or slowing down a turntable

try a different sample and tell us what happens!!!!!!!!

Yeah i know what you mean..... but im thinking it might be a preference thing... as some loops/sample come as fixed.. and the only way to alter them is to re record them or change preference

if your short on samples....In the mean time why not sign up to loop masters.... you can browse everything they have to offer and most packs you can download samples from it.... (for trail purposes only) try before you buy or have a bit of fun with...as they are not licensed for use in production