Logic Pro Strange invisible note sounding

[edurbrow]

I hear a midi bass note between the locators, but I cannot see where it could possibly be. There are no hidden tracks and only one track is soloed. And there is no region in that soloed track at that point.
Any ideas?

 

[Michael Scheurer]

Is it a sustained note? That’s what I’m hearing from a random instrument when I’m in record mode…