I use imported samples often,you are right that sampling using the MUSIC software does not give the same results as sampling using pc software,But i have learned a few tricks that will help enhance the quality of the imported samples when trimming/cutting.
I've noticed that when you import single hit samples such as kiks,snares hi-hats etc that are very short,When you trim them to size you lose the quality.Its almost as if you have lost the attack that the sample had originally,Makes it sound less crisp/punchy,I havent found this to be too much of a problem when using longer samples.(Although if you set the sample rate to 44khz it sounds nothing like it)
I always trim any sample before increasing the volume in the ADSR envelope because i've noticed that if you increase the volume first then trim/cut the sample,You will most likley be left with horrible clicks,crackles & pops.
A good tip for trimming and setting a loop point of any sample is zoom in to the wave pattern as far as you can and cut the sample at a point where the squiggly line of the waveform meets the central horizontal line of the sample editor,This will make the sample end in a neutral position and will get rid of the click that you might otherwise have had.
I use this same tecnique to set a loop point.For example if you trim the end of the sample so that the wave line comes from above the central line and is trimmed so that it meets the central line,Then i would set the loop point at a position where the wave line also comes from above and meets the central horizontal line of the editor,Thus creating a continuous wave,if done right it should not snap,crackle,pop or anything like that.
But it can depend on the sample,For instance if the nature of the sample changes from where the loop point is set,To where the sample ends it might be difficult to make the end blend with the loop point.
Trust me this works