Resampling is nothing more then recording an instruments and placing the results on a sampler so as to be able to play the samples.
So what you really need to focus on, I guess, is in how you should go about making a sampler instrument. Then there's some stuff to look out for, such as:
your audio editor (or daw) must have a snap to "zero crossing" points - so as to avoid audio clicks. you can sample all the notes you want (a couple of octaves or more) and then assign them to the respective keys, if you're planning to use this as you would an instrument (play it, in other words). or you can place one sample and rely on the repitching algorithm within the sampler to do it. sampler instruments can of course be mono or polyphonic or legato - and you can use portamento to.
from the moment you record something, all further processing to the source will have to be either the sampler's own modules, like filters, envelopes and lfos; or further post processing.
think that's about it. but before that, watch your gain staging: you shouldn't record to loud or to low. to loud because it can create distortion if the signal clips and it's a good idea to have some headroom left, not to low 'cause the lower you go, the closer you are to the noise (search signal to noise ratio), hence you'll be bringing it up along with the signal with further processing (mastering included).
I think a big part of your question has more to do with the arrangement and composition then with sampling routines. As far as that goes: watch your timming, try and use scales so that things sound more cohesive and harmonic, questions and answers are always a good way to go as far as placing sounds together goes. Then you should think about distributing sounds across the spectrum and panning (and depth) - this starts with the octaves you choose to play... Time stretch changes the timming, adds some kind of repitch algorithm to the sounds that changes its harmonics entirely, along with its tunning (gets out of tune), so this can also be your problem. There's repitching plug-ins (and nowadays you get that inside some daws to) like melodyne or auto tune (by antares) that you can use to correct the pitch even after some post processing that changes pitch (like time stretch).
I'm using the Virus C with Ableton (and Logic), absolutely no problems at all. The mistery island editor also works for the TI range. it doesn't work with the usb connection, just good old midi and then the analogue inputs of your sound card. don't think the other editors available support the virus ti.
hope it helps. cheers
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