The basic question is why the audio source patch of the first audio track will not toggle on.
I'm looking for confirmation or the correct reason.
I created a sequence preset based upon the DLSR 1080p preset and change it to be square 1080 x 1080 but did not change any of the audio settings. I created a sequence with that preset. The preset has three audio tracks.
I put my source sequence and set in and out points and then hit over write and it put the audio in a new (fourth) track. So I undid it and then tried to toggle the source patch "light" of the A1 track but it will not toggle on.
After reading and surfing, I came to the belief that this is because my source audio is different. The properties of the source says 48000 HZ - Multichannel while the target sequence properties says 48000 HZ - Stereo.
It also seems I can not change these settings once the sequence is created.