two filters

[Tim Kleinert]

As the title says, two DIY filters.

The "MorPhilter" is allows continuous dynamical morphing from 24dB-LP (-64) to 12/12dB-BP (0) to 24dB-HP (+64) characteristics. Nothing special otherwise, just an exercise with poles and phase relationships.

The "Filthy Filter" uses the Resonance Mod input of the NordFilter module to add odd harmonic distortion to the resonance. This is neat, cheap, and doesn't seem to need integrating mixers to stabilize the high frequencies -so the filter keyboard tracking remains intact too. But note that this only works properly when the filter gain control (GC) is turned off, and the filter type is set to LP. The 24/12dB option is available, though.

Also, since this circuit is compressive, it is input-sensitive. If you max out the resonance, but drive the filter input very hard, you'll won't get much of a resonance peak. Back the levels off a bit for more reso peak.

best,
tim

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MorPhilter TK.pch2
Description:	dynamic LP-BP-HP morphing filter	Download (listen)
Filename:	MorPhilter TK.pch2
Filesize:	1.48 KB
Downloaded:	1581 Time(s)

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FilthyFilter TK.pch2
Description:	filter with odd harmonic distortive resonance -"dirty" sound	Download (listen)
Filename:	FilthyFilter TK.pch2
Filesize:	1.96 KB
Downloaded:	1632 Time(s)

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[cebec]

very nice, tim, thanks!