" I'm getting used to playing guitar under the intense scrutiny of the guitar-smashing gentleman I mentioned above, and taking it coolly when he escapes his assistant's attention and comes and takes a swipe at me."

Ten years have passed since that was written (first post.) I think we can safely say that the sound of the guitar was driving the poor guy nuts -- because we know now that autistic people do not hear things the way most people do.

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Sorry, Anita, I don't know the answer to your question.