How can I mark three tracks at a time?

I have a rhythm track and two music tracks. I would like to see as accurately as possible how they align. I would like to make a single line top to bottom through all three tracks. Is there a way to do that? (I’m very new to Audacity. I think it’s amazing!)

https://www.youtube.com/watch?v=dbqJVC6kQ50 In this YouTube demo when the narrator selects, it selects both tracks (similar issue). He doesn’t seem to do anything special. When I do the same thing, it only selects from the track where my mouse is.

tia
las

P.S. I’m running Windows 10, Audacity 2.4.2

las14,

If you click in the top track or make a selection in the top track, then hold the shift key and arrow down, the line and/or the selection is copied down.

Is that what you are trying to do?

Mike

Well, that works for selection, but not for just making a line. If I just click on a track it makes a vertical line, but if I move my mouse at all, it makes a tiny selection. I see that if I hold the mouse key down and drag it to the lower tracks, they, too, get that same selection, and I suppose I could use one edge for purposes of alignment diagnosis. I don’t see that the shift key makes any difference. It’s that single line (the beginning of a selection, I guess), that I’d like. Or maybe a “clip” line? I don’t really understand that concept.

If I click once in the top track and release my mouse button, then zoom in to a single sample, my line in the first track is resting on a single sample. If I then do shift and arrow down, the single sample selection line drops down through other tracks.

PERFECT!!! Thanks so much!