Error sound help


New member
I seem to have a ghost error sound within my session that I cannot find.
When I play my vocal or instrumental busses separately I don't hear the error. They are fine.
But when played together there is a pop/crack/distortion sound every time at exactly 57 seconds.
I exported each bus and imported them into a new session. The pop/crack/distortion is still there.
It's very noticeable. But not on the individual tracks. Just when played together. Anyone have any ideas to try?