Updates to musicsynthesizer.com

[Grant Richter]

You can access my personal DIY page through the "Grant Richter"
link at musicsynthesizer.com

I have added the Expander Multi Function VCF schematic
(also has some general introduction to the idea of summing the outputs of
multiple lowpass stages to get other transfer functions, the inverters on
some stages
are require because the CEM3372 stages are non inverting)

Also some pictures of my PAIA 2700,4700 and 9700 series units with outputs
from various visual synthesis experiments conducted with the modules.
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