Re: Copying left channel to right Use the drop-down menu on the left and Split Stereo Tracks. [X] Delete the blank one. Select the remaining one by clicking just above the MUTE button. Edit > Duplicate.
How do I combine left and right on audacity?
Choosing "Make Stereo Track" from the Track Dropdown Menu of the upper track of a pair of mono, left or right channel tracks (in any combination) will combine those two tracks into one stereo track.