Until now I was used to record my comments with a mono-channel microphone and create a stereo effect using the "Fill with left" audio effect . I am now using Premiere 2019 and when I bring the "Fill with left" effect over the audio track, the pointer of my mouse display a "no entry icon" and I am unable to apply the effect (same problem with the "Fill with rright" effect.
Is there an explaination to this situation and a way to correct it?
I often use the exact effect you are talking about. I wonder if perhaps the audio track in your Sequence is actually a MONO track and not a stereo track and that is why Premiere won't let you use the FILL effect?