[sdiy] Hand-matching capacitors for filter stages

[David G. Dixon]

> >... What specific quality of polystyrene is so
> >desirable for filters, and how exactly does this enhance the filter's
> >performance?
> 
> I assume that you've read Harry's treatise?
> <http://www.musicsynthesizer.com/txt/caps2.txt>http://www.musicsynthesizer
> .com/txt/caps2.txt

Yes, several times.  It is largely silent on why a filter would sound better
with polystyrene, and says that mica is good, C0G ceramics are good, and
both polypropylene and polycarbonate are decent replacements for
polystyrene.  

None of this answers the original question, which was directed more at Tom
Wiltshire's breadboard experiments.  Specifically (and without trying to
sound too snarky), I'd like to know how the filter was better when one cap
was used instead of another.