Hi kla4

I’ve taken the time of actually explaining it to you in my post, but clearly you haven’t even read what I’ve said.

I cannot make it any more obvious.

1: I recorded the song track by track prior to recording the video.
2: Then during the video I play back my multi track recording and I play over it with one more track Live.

This is how every workstation user in the world make music.

Regards
James.