I am a longarmer and I do everything free hand and free motion.
My machine is not computerized.
Pantos is following a paper pattern from the back of the machine with a laser light. This can also be called edge to edge or E2E.
All over pattern or E2E can be either free hand or panto. If I do a free hand meandering, ie... leaves.
Custom work is free hand ,free motion using rulers and your imagination. Most LA use chalk or disappearing ink to mark certain areas with a hand drawn pattern.
Using pattern boards,groovy boards is used from the back of the machine with a stylus to make the over all pattern AKA E2E.
Hope this helps :-D