[sdiy] PPG Wave SSM2044 filter

[Dave Manley]

Colin f 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.
>>     
>
> But do we think PPG were after a subtle change in filter response ?
> Or was it simply that a 620p cap was 2 pfennig cheaper than 820p ?
>
> Cheers,
> Colin f
>
>
>   
Could it be as simple as the designer thought it sounded "better" this 
way? Engineering by ear? :-)

-Dave