I think you have your terms mixed up. The things you describe more attribute to general concepts of music production, especially since you're talking about recording live marimba.
Electronic music is a term used to describe music with a heavy focus on synthetic textures (trance, house, big beat, DnB, dubstep). Now I know some electronic music has marimbas, but I have 80% confidence you're more asking about how to make music on the computer.
It's not referred to as electronic music generally, it's just "music" or even "computer music" would land you answers more accurate with what you're looking for.
Just a tip on how you can improve your question so you can get what you want quicker, since it is a broad question not any single person on OCR (with the exception of maybe Rozovian) has mastered answering. If anything, he's already answered the question that you might be actually asking.