Ebbie,

if you read my post you'll see that I have clearly stated right at the beginning that I did not mean to address how the cracks were made but only how it comes that they are perceived as coming from inside the head. My theory starts with the assumption that the cracks are real and then goes on to explain how multiple cracks can fool the subsystem responsible for recording the spatial position of a sound. Real cracks should be recordable, of course.

In my theory the cracks are real but the perception of spatial origin is an acoustical illusion.

Wolfgang