Donny,
If your friend is a good musician, he could begin using the arranger in a very simple manner and, little by little, discover all the advanced possibilities. That was my strategy when I started playing, many years ago. A good and simple way to start would be turning the "drum machine" on, playing bass with the left hand and melody/comping with the right hand (piano, electric piano). A good musician should make this sound like a trio, almost immediately.
-- José.