good luck i know alot bout time stretching but i dont know about the f16
your best bet is to search the site more and get as much research as possible!!
as for time stretching its easy to do but complicated to explain!! u just got to trust your ears!! good luck
There is the time stretch right there in the sampler channel window. You can control the pitch and time. Use pitch knob for pitch and MUL knob to manipulate the time. I hope this helps.