Ok, forget the scenes for a moment. You have a track recorder assigned to a flex track and have trig and recorder trig on that track? Amp hold is turned up (at least as many steps as the track is long or inf)? With track button + bank you can check if the recorder does record audio.
Does that work so far? If nothing gets recorded, check recorder setup.

If you see a waveform being recorded, check scenes. You simply have two scenes, one scene has your recorder flex track on minimum track level and all other tracks on max level and the other scene does the opposite.

2 Likes