U can change parts in the arranger…

so to rule out any human failure… u could set up a loop of your pattern with some partchanges done by the arranger…

myself, i never change parts on the fly for the fun of it… (and thats my loss… i have seen people have excellent result) … i do know that when i save a part… sometimes i hear glitch.
never noticed weird glitches by switching… but like i said. i never use it in a musical way.