real time pitch shifting/hard syncing

I don't mean to be blowing up this area of the forum, but I was curious if there was a way to accomplish this...

Basically I would require that something actively shifts the pitch of an input while playing, but retriggers at a fixed rate using something like an impulse oscillator... so in a way sort of like a granular effect. I plan on using this in conjunction with sampling/synthesis so using a regular sync oscillator is a no go.

Any ideas? Bit of a newbie but don't be afraid to throw some vocab at me.