MATRIXSYNTH: JH Variable Slope Filter / Phaser


Sunday, March 15, 2009

JH Variable Slope Filter / Phaser

via JH on the AH list:
"I'm thinking about making PCBs for this.

A mean little module from my JH-3 Modular.

6 filter poles, realzed with OTAs and combined FET / Bipolar buffer stages.

Variable Slope function for 6-pole VC LPF.
Voltage controlled Pole Spread for Phaser mode.
Zeroes switcahbel in pairs, i.e. a lot of combinations of all pass and low
pass stages. Positive and negative feedback. Positive and negative wet/dry
mix. Rather special overdrive behaviour (Dirty!), and (IMO) pleasant way of
breaking into oscillation.

Old picture (from JH-3) [pictured]

Demo 1 (Arpeggio from OB-8, with delay and reverb. First few seconds dry - then playing with phaser.):
http://electro-music.com/forum/download.php?id=16715

Demo 2 ( This is something I recorded a few years ago. I don't remember all the details. But it was a Split on the OB-8, bass sound on left hand and organ sound on right hand, and the whole thing was processed with the Variable Slope Phaser / Filter to get that "pulsating" sound. Lots of delay and reverb as well, obviously.):
http://electro-music.com/forum/phpbb-files/oct_06_zwischenstand_edit_189.mp3

JH."

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