Something strange has started happening with my 2021 version. The plugin on the Thru track makes noise in response to my MIDI controller only when I hit 'Play'. Once I hit 'Stop', the little VU meter on the Thru track continues to respond to the controller, and the keys under the 'Pianos' tab of the mixer window respond, but there is no sound. Could I have accidentally enabled a 'make sound only during Play' option or something? It didn't used to work like this.