I am watching the Roku Channel app and the descriptive audio is playing on some shows but not others. I have checked all settings and audio reader is disabled. It’s driving me crazy!
Descriptive audio has nothing to do with the screen reader. While the video is playing, press * on your remote and go to "Accessibility & captions". Choose the "Audio track" option and select one of the other choices.
As @renojim said, the Roku default method of accessing your choice of audio track is to press the * key on your Roku remote while viewing the program and examining the options presented.
But more and more channels are not using the Roku default but instead substituting their own method of access -- I'm guessing this is so they will have consistent controls with versions of their app running on platforms other than Roku. Often these options are accessed by pressing the up and/or down cursor control keys while viewing the program to pop the channel's own control options on the screen.