Ceramic caps.. enlighten me please

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Hey guys.

On several amps there are ceramic tone caps. I read those tend to be microphonic, but still they seem to be the ticket on some amps.. supro for example. What is the purpose exactly.
And am I correct that the 470p is the ceramic version of a mica 500p? I never saw a mica 470p...

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surf up "the different cap types" gazzilion explanations
read this for some musical insight to different types/manufactures


 Do capacitors sound different? (el34world.com)

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Class 2 ceramic caps have various effects  / significant imperfections, see https://en.m.wikipedia.org/wiki/Ceramic_capacitor
Of course that could make them just the ticket, we’re not dealing with hifi here