[sdiy] Old analog synths chladni patterns!

[harrybissell at copper.net]

z-plane ???   :^)

H^) harry

>>At 04:02 PM 5/8/2007, karl dalen wrote:
>>>To be able to distinguish the genuinety of hand built analog synths
>>>the use of a pattern recognition system must be used like the:
>>>
>>>http://www.phys.unsw.edu.au/jw/chladni.html
>>>
>>>However just pouring some sand on top of the synth wont do! :-)
>>>
>>>However it could be used to visualizing filter resonance patterns.
>>
>>How?  Where's the surface? 
>>
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