Im using real Single Cycle Waveforms which have the right length so that they equal the middle C - and are therefore in tune. Like the ones that come shipped with the Digitakt. Or the ones from Adventure Kid (AKWF) - which became the standard in years, literally. Load the Waveform, turn Loop on and youre all set. Use PLocks to change the Waves if the need arises.
If i use the Technique on longer Samples i load one of the included Waves to a different Track and use it as a reference for tuning. Easy and fast. I then adjust the length of the actual Sample until it matches my reference - done! No need for Slices or any complicated workflow here. If i want a different portion of that Sample i simply change the Start Point and the Length will always follow. Either by hand or with an LFO. And thats it And thats why i love the DT so much Everythings easy, everythings fast!