RedSkyRoad
Clicking the AUDIO or MIDI toggle does not work all the time, I would repeatedly click the MIDI toggle and it will keep on highlighting the AUDIO channels - seems buggy
No, it works as it should, but you need to understand how to show and hide the tracks. What's highlighted isn't the important part, it's the boxes you uncheck. According to the help:
In the list, check those tracks you would like displayed in the view in which you are working, and uncheck the rest. You can use SHIFT-click, CTRL-click, or the quick select buttons to select multiple modules; press the SPACEBAR to check or uncheck all the selected modules at once. Please note that the track display selections you make in the Track view do not affect those in the Console view and vice versa. As with similar dialog boxes, to get rid of any highlights, click on a blank space in the dialog box. The way I'd do what you want is first, unfold any track folders. Then assuming everything's selected, I'd click the Audio button and either hit the space bar or uncheck one of the audio track buttons - they'll all uncheck. Now you'll see only MIDI and Instrument tracks. If you want you can also get rid of the instrument tracks, leaving only MIDI.
The Spacebar is your friend because it can check or uncheck all of a selected group or checkboxes.