Hello everyone,
thank you very much for your numerous answers. I hadn't expected so much response. I'm really delighted!
A little more information from me:
clicktrk.sty is a file that I found here in the forum during my research. I also tested metronome.sty but unfortunately this track can't be panned either.
Let me say a few words about my application.
As a jazz musician, I regularly meet up with various other musicians for jam sessions, both public and non-public. For our non-public scene sessions, I would have liked to use the invaluable advantage of the continuous chord representations in BIAB. This way, musicians who are not familiar with the progressions of the tunes can also participate "song form safe". For my application, I therefore deliberately do not want to use classic methods of using click tracks. As I said, it is not about public sessions. This would undoubtedly require greater reliability.