Quote Originally Posted by Dustin Zahn
Take for instance I have a sample, say a vocal or synth stab that is in A. But, in order for it to fit into my track, I want it to play in C without **** up the pitch. In VSTi like Kontakt or just using the regular keyboard thingy in FLStudio as you progress up or down the octaves...it just pitches the sample up more or pitches it down. Any ideas?
yeah, real time pitch-shifting right? kontakt can do that, copy-paste from their website:

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The two Time Machine modes allow real-time manipulation of length, pitch, and formant. The Tone Machines imprints a playable pitch onto the sample and maintains the same length across the keyboard.
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i don't have mine available on this computer, but if i remember right just select "tone machine" from the pulldown that says "sampler" by default.. you can also route different modulations to the pitch and it keeps the tempo correct.

ableton live can do that very well also, it's designed to change tempo/pitch on the fly for the whole audio