Hi Dikki
Your quite correct about samples, but as I have mentioned before, manufactures (Both Software and Hardware) are slowly moving away from sampling towards sound modelling which requires much reduced ram (Disc streaming is also not usually required) but increased processing power.
Therefore its possible that Ketron has developed an algorithm to model the actual loop in relation to the instrument in use, e.g., the loop is modified as if it was Midi loop being played using a Midi pickup or an arranger chord system. (And of course a Real Guitarist)
It will be interesting to see what it actually does when it is released.
Enjoy whatever you play

Bill