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Ok, that makes sense, the vibration's frequency is changing
constantly, so is there an obvious link between the current frequency
of vibration as a note resonates (you'll notice sometimes it doesn't
resonate and therefore doesn't give any definite pitch). I'm getting
the impression that the pipes are 'tuned' to certain frequencies of
vibration and only result in resonance when one of these frequencies
of vibration is exerted on the pipe at particular points in time.
Perhaps I read in to what your saying though, hopefully you can clear
that up : )

When you say that using noise to shake a resonant system will cause a
pure tone with harmonics, how are the higher pitches (later in the vid
I think) explained? Although these higher frequencies must be related
to the normal lower frequency (the 'fundamental' I suppose) its
actually perceived as a pitch difference (as if the fundamental was
missing or now of a higher frequency). This is unlike a violin with
the difference is simply timbre is it not?


You've certainly helped me allot already with thinking about how it
sounds, cheers.