This is a narrated video to reveal the sneaky little drawer where one can find both basic and elaborated track controls.
I never considered it hidden, but my Dad did. He could see his recently recorded signal, but he could not hear it. So, he deleted it and tried again and again and again... poor guy.
His recently recorded track's volume too low compared to the accompaniment track's (drums). His guitar track was set to the default volume, and that's too low.
This is a quick video to show him the track controls area.
Teaching My Dad GagargeBand for iPhone Part 2