Hacked this thing together today based on the @lookmumnocomputer Painfully Simple VCA:
Works surprisingly well.
You didn’t get lazy and drop the diodes. Nice work! By comparison, I was able to hack together enough of a human appearance for myself to leave the house for an hour last night. I might have figured out how to make a bidet out of a dish sink sprayer and a t-junction.
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That would be a triple La-Z-A 
. But that joke only works in US English…
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Will it work with a 555 timer as input and this as the vca for it controlt by a 5volt dac??