Thanks for this. I tried that but <ctrl A> selects absolutely every clip in the sequence, video and audio. I needed it to select everything to the right of a point in the sequence. For example, from 2:30 onwards, assuming there is a clear definition between clips each side of that time.
I can select all video tracks to the right of that point by selecting the first clip, then with the 'shift' button held down click on a clip in the adjacent corner to the far right. That selects everything to the right of a point. But this method wouldn't work and include audio clips.
I had to then individually select each audio clip. With a lot of audio clips that's a bit tedious.
The solution I found is to first select and group all the video clips. Do the same for all the audio clips, and then group both groups together.
It works. Sadly, as soon as you move them they all deselect. Not the end of the world, but would be good if they stayed selected so you could fine tune.