This is 3 valve filters wired in parallel, 2 bandpass and one that is switchable from low-pass to high-pass. The Q is adjustable from subtle to oscillation.
The 3 filters can all be controlled using 1 master control knob. There are other adjustments to make the master control knob have a different effect on each filter. So when the master knob is turned the filters sweep in different directions and by different amounts.
The result is very rich complicated filtering. This is further enhanced by imperfections of the valve design. There is lots of soft distortion and cross-talk between the 3 filters. Because the cross-talk is in both directions, it results in chaotic behaviour. The chaos is nice and subtle when the Q is low, and quite extreme when all 3 filters are oscillating.
Please Leave a comment
Date Posted: 22:01, 23 09 2012
Message: Hello man!
I write you just to tell you're just awesome!
I found here some things i have thought up, found them already assembled(like the links about optical piano(bad example, i know)), and i can't find the words to say, what i feel.
Mmm, i want also to make some questions, about you and music. Such as "do you write music?", "do you have a band or any guys you have musical relationship with?", "what bands did you like in childhood and what you listen to now"... Well if you'd have any time, write me please about yourself in more comfortable for you way. Or just send me some links to your bio if you have/don't have time.
Date Posted: 15:17, 01 06 2012
Message: Just discovered your site through Sonicstate. Dan Worrall now owns this unit right? He posted a video about it a while ago: http://www.youtube.com/watch?v=pEMRmX-vTow
Amazing stuff, take care!
Name: Marco Polito
Date Posted: 00:15, 18 04 2012
Date Posted: 15:53, 14 03 2012
Name: Jono Metamono
Date Posted: 18:28, 01 01 2012
Message: That's really impressive Nick - top stuff
Date Posted: 09:01, 31 08 2010
Message: very very very amazing!
Name: Nick\\\'s world of synthesizers
Date Posted: 21:20, 27 03 2010
Message: This guest book is working now