[sdiy] PPG Wave SSM2044 filter

[Tom Wiltshire]

Does anyone know/care to speculate on why the PPG Wave used a non- 
standard capacitor value for the final stage of the filter?

Would it affect the filter's rolloff or resonance?

Most designs follow the datasheet and use 10n for the first three,  
and 820p for the last one. PPG Wave uses 620p.
The Korg Trident/Monopoly use 6n8 and 560p, but this doesn't actually  
change the ratio at all, only the basic cutoff.

http://www.electricdruid.com/index.php?page=info.ssm2044

Thanks,
Tom