[sdiy] PPG Wave SSM2044 filter

[Antti Huovilainen]

On Fri, 22 Jan 2010, Matthias.Herrmann at jeppesen.com wrote:

> in the MIDIbox forum i read it would affect the resonance (no proof 
> though).

Resonance happens at the freq where combined phase shift from all four 
stages is 180 degrees. Changing one capacitor changes the phase shift and 
thus resonant frequency.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
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