Posted: Sun Mar 15, 2009 11:30 am Post subject:
Variable Slope Filter / Phaser Subject description: Interested?
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.
JH.
jh3_varislope_phaser.jpg
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_________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
Posted: Sun Mar 15, 2009 11:53 am Post subject:
Demo
Arpeggio from OB-8, with delay and reverb.
First few seconds dry - then playing with phaser.
JH.
variable_slope_phaser_arpegg.mp3
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_________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
Posted: Sun Mar 15, 2009 2:18 pm Post subject:
another demo
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.)
JH.
oct_06_zwischenstand_edit.mp3
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_________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
Sounds good Juergen! Is this related to the variable slope VCF in Electronotes? IIRC, that one was also 6 poles, but it did not have feedback.
Romeo
It's a combination of two ideas I found in EN.
One was a variable slope VCF, the other was a combination of LPF and Phaser. (But this has been so long ago, I don't remember the details.)
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
But is yet another phaser, so why not use either the Tau phaser or the Schulte phaser as the phaser part in this project?
Totally different architecture.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
Finished the audio part.
Lots of space left on the board.
I will include a Noise + Sample & Hold Circuit, so you get these clocked random modulations without any outboard modules. Also, an on-board power supply, so this can become a stmp box as well as a modular synth module.
JH.
Now playing: Kitaro, Silk Road
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_________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
Posted: Sat Mar 28, 2009 5:12 am Post subject:
More Features!
Just wanted to tell you my further plans for this.
The Variable Slope Filter / Phaser will get a very special on-board LFO that is derived from my JH-4 synthesizer.
Voltage controlled Rate and Depth, of course.
But there is is more:
You will be able to crossfade between waveforms with a potentiometer, or with another control voltage.
Starting from ccw end, the waveforms will be:
Triangle, fading into Sine, fading into Square, fading into Sample&Hold, fading into audio rate self-modulation.
Let me explain that choice:
Triangle fading into Sine means rounding the edges.
Square fading into S&H means rhythmic modulation with more or less randmness thrown in.
S&H fading into audio self modulation means mixing and fading two different flavors of madness. Especially with high resonance.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
That's great news about the LFO. Are you using some sort of interpolating scanner for the waveform xfading?
Yes. But yet another variant that allows different height, width and slope for each window, and uses only 2 transustors plus an OTA per channel.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
dig the c.s. lewis quotes, btw. one of my fave writers since i was a kid...
I read about every book of his adult fiction and his theological work, in my twenties. Now I re-discoverd him, currently reading his collected correspondence. And I finally started reading his spiritual teacher, George MacDonald. Very heavy stuff, in beautiful Victorian English, challenging and comforting at the same time.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
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