I am using 4 audio tracks A1, A2, A3, A4. Tracks A1 and A2 for one stereo signal, A3 and A4 for another. Strangely, I only hear A1 and A3. Tracks A2 and A4 give no sound! When I copy a clip from A4 to A3 or from A2 to A1 then these segments, not giving any sound in A4 and A2, DO give sound in A3 and A1. And visa versa. There's nothing wrong with my hifi. I must overlook something. Any suggestions?

Can you see if your VU meter (on timeline or audio tool) are both dancing when you play?

Check your track panning by opening the audio mixer tool (bottom slider). It should be alternately panned (1-L/2-R, 3-L/4-R)

One tip, for mono sources like voice or narration, you can use one track and just pan it center. Makes timeline one track cleaner.

have fun!

I AM having a lot of fun.

There were no issues within MC. It turned out to be my stereo-set being wrong. I solved it.

What do you mean by pan it center?

You want to send the audio track to both L&R speakers. By default, timeline audio tracks are panned alternately L/R so when you use a single (mono) track, it will only come out on either left or right. You just need to pan your mono track CENTER to feed both speakers.