One thing nobody has mentioned is that if you have the windows version of BIAB you get RealBand free. I know you know your way around Cakewalk but think its too complicated for your grandson. I think he would find RB quite simple to master. It's a DAW but still retains BIAB features. If he opens the BIAB track in RB he'll see all the tracks laid out simply. To regenerate any part of a track highlight the area you want and right click, and choose regenerate. What you can do in BIAB is amazing but i've been using BIAB for over twenty years and find it easier to do many things in RB because it's so transparent. Try it and you'll see what I mean. I treat it as BIAB with a much simpler GUI.