Hi, Welcome to the Forum Klem !
Here are all important links:
http://lmms.io/forum/viewtopic.php?f=1&t=4740
-A few rules and useful forum instructions
You can chop audio with many programs. Audacity is recommended. However, i suspect you want a program that will auto-chop, and thats a whole other ballgame. I do not know a free program, that can auto-chopvocal chops from an acapella,for a remix.
But, Manual -Yes: Audacity
It is free, solid and well maintained
We dont hesitate to recommend it :
http://www.audacityteam.org/download/