I know that if the delay is constant, a good musician can compensate for it. I think it's a lot easier to hear that two things don't happen at exactly the same

I know that if the delay is constant, a good musician can compensate for it. I think it's a lot easier to hear that two things don't happen at exactly the same time than it is to tell whether two things happen 200ms or 300ms apart. Musicians have that internal metronome to compare things with.