
However what bothered me all the time was the fixed tempo.
Now I've found a working solution!! In HD-1 engine there's a function on the control surface (Tone Adjust) called "pitch stretch". See page 38 in the Parameter Guide. I it changes the speed of the sample but compensates for the changed pitch. I added some EQ high frequencies to compensate for lower sound quality.
It's not perfect but now in a live environment very usable for me.
Edit title: it's about KApro Epic Composer (maybe also working for others with phrases)