Appending one track after another

Windows 8.1. Audacity 2.2.1.

My project is this: I have a CD with a complete recording of Beethoven’s Fidelio where the first half of the opera is on the left channel, and the second half of the opera is on the right channel. I have 28 tracks that I have to split and link up, first all the left channels, then all the right channels.

I’ve imported two tracks, just so I can learn how to do this. I’ve learned that I can split the stereo into mono, and I can completely close the right channel tracks. I’m just doing the lefts now. I’ll do the rights later.

I’m trying to link up two consecutive left-channel tracks, i.e. append the second track to the first. There will be many more, but I just want to learn how to do this with two.

In the FAQ for editing, item 2.3, it says, “Select the second file by clicking above the Mute/Solo buttons on its Track Control Panel (where the sample rate in Hz is shown).” Just in the last few seconds I’ve learned where to click to make this selection.

But now it says, “Choose Select > Region > Ends to Zero Crossings.”

I see no such option as “Ends to Zero Crossings” under Select>Region.

I think I’ve figured out what I need to do. The “Ends to Zero Crossings” command is not present, but I don’t think it’s relevant. I’ve been able to append several tracks, left channel only. I’m not sure what’ll happen if I save it as an Audacity project and then try to bring it back in and append more tracks. We’ll see.