Well it’s topic related so : I used different pre slice length, for tuned looped slices, hence tuned sampling!
If I want to make a tuned synth with incoming signal as osc, whatever the tempo is, I use different slices, all placed at the beginning of the sample (yes, possible).
Ex : C = 674 samples, G 450 samples.
Slice mode.
Change LEN=TIME for octaves up (128 / 64 / 32 / 16 / 8 / 4 / 2 / 1)
Weird example, crossover between incoming signal and realtime sampling, pitch determined by slices. 
Number of samples.