I'm thinking of doctoring the tracks my son put in his video.
What do you mean by doctoring tracks?
I want to edit the music to be more robotic, he is pretty young so I don't think he will notice.
It is wrong to lie and trick children. You should create your own videos and not modify existing ones.
It's not like he is going to notice.
Kids are more observant than you might think. He will find out eventually. You could just copy his video and make an edit for yourself and not the original.