There is no Accessibility > Audio Guide option under settings on Roku 3.
@Dcshell2002, are you sure your TV doesn't have a setting for this? Your Roku 3 would have no way to know you're increasing the volume of the TV.
Press options button then press accessibility and captions then press audio track and change the language it only have spanish and english just change it , that how i turn it off
While watching you can press pause, you should see a box that says (captons & audio tracks, click on it then should have 3 choices now choose audio track, there you'll have 4 choices. There's 2 english choices, espanol,francais now choose the english option that says (english 2 of 4) which has no audio description, the other english option says (english 1 of 4 with audio description. Thats the only way on my roku 3 & whatever others that don't have the accessibility option under settings. Hope this helps any others, as it took me just sampling options & then checking if it disabled the audio description. FINGERS CROSSED FOR YA.