When I shared the fact that I recorded my bands at least once each week (usually Fridays) many of my peers said they couldn't stand to listen to recordings of their bands until after UIL. Sorry but that's too late. I also let my kids listen to portions of our rehearsal recordings with some surprising results. A director can harp&harp about what needs to be worked but "a picture is worth a thousand words". My students became much more aware of our needs.