Posted: Thu Aug 06, 2009 3:23 am Post subject:
Breakdown Filter Module Subject description: 8 VCFs stepper
my latest built.
these are 8 multimode filters and a controller board.
the audio steps thru the 8 filters. each filter provides attenuation for external CV, cutoff, resonance, pan and mode. the controller provides external CV in, clock in, manual step, reset, manual reset, audio in, left out and right out.
why 8 filters instead of one filter? imagine you just use one filter and want to control different CV amount, mode (LP/BP/HP) and pan (L-R) for each step. how many VCAs, mixers and CV sources would this require?
audio samples will follow. however, this is still in prototype status. the controller is actually a sequential switch, thus it works nice with pulsewave inputs, whereas triangle and sine result in pops.
i think i will do a new controller board using simple VCAs, suggestions? _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
Posted: Thu Aug 06, 2009 6:15 am Post subject:
Re: Breakdown Filter Module Subject description: 8 VCFs stepper
fonik wrote:
the controller is actually a sequential switch, thus it works nice with pulsewave inputs, whereas triangle and sine result in pops.
i think i will do a new controller board using simple VCAs, suggestions?
Sounds like a good place to use the JH or DT interpolating scanners? In my system I have a bank of six FET-based VCAs and I've done some wavescanning with them, using a six phase VCO. This is a more versatile approach, but a more complicated build.
http://www.electro-music.com/forum/topic-19841.html
Posted: Thu Aug 06, 2009 6:56 am Post subject:
Re: Breakdown Filter Module Subject description: 8 VCFs stepper
thank you for the suggestion, ian. i will take a look at that.
what about using a 4017 counter and controlling a set of VCAs with it's logic gates? i could soften the edges with a simple resistor/cap lag, i guess.
frijitz wrote:
fonik wrote:
the controller is actually a sequential switch, thus it works nice with pulsewave inputs, whereas triangle and sine result in pops.
i think i will do a new controller board using simple VCAs, suggestions?
Sounds like a good place to use the JH or DT interpolating scanners? In my system I have a bank of six FET-based VCAs and I've done some wavescanning with them, using a six phase VCO. This is a more versatile approach, but a more complicated build.
http://www.electro-music.com/forum/topic-19841.html
Ian
_________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
but not mine. i like the Tweakbench Breakdown VSTi very much, so i thought i could try an analoge version (without AR, though). _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
Joined: Feb 23, 2006 Posts: 111 Location: Chicago
Audio files: 2
Posted: Thu Aug 06, 2009 10:42 pm Post subject:
fonik wrote:
i like the Tweakbench Breakdown VSTi very much, so i thought i could try an analoge version (without AR, though).
Love the Tweakbench plugs! I even donated money to him.
It's interesting to see someone else using software/VSTi as inspiration for hardware. I actually got into modular synths by building mock-modulars in Reaktor 2. And the circle goes round and round
Nice one!, I though about doing something similar, but with selectable filter(303, moog, ms20, wasp) + midibox... not on my queue list top place though heehe
btw. similar features can be found in VA hardware(with step sequencer filter tracks):
2000 - Korg ms2000 synth
2002 - Roger Linn's Adrenalinn guitar fxs processor
Would be interesting to see if some older hardware does this too besides custom massive modular setups _________________ Freddy, riding the wave!
http://www.hakkenmusic.blogspot.com
Posted: Fri Aug 07, 2009 3:54 am Post subject:
Re: Breakdown Filter Module Subject description: 8 VCFs stepper
fonik wrote:
why 8 filters instead of one filter? imagine you just use one filter and want to control different CV amount, mode (LP/BP/HP) and pan (L-R) for each step. how many VCAs, mixers and CV sources would this require?
Posted: Fri Aug 07, 2009 4:09 am Post subject:
Re: Breakdown Filter Module Subject description: 8 VCFs stepper
TekniK wrote:
why not crop everything very tight on one PCB?
1st: i wanted PCB mounted controls
2nd: i would have to buy eagle standart first
3rd: i now can replace the controller board (not envisaged, but now i am happy about it) _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
Great idea Fonik.
I wondered about doing something similar with an old graphic EQ, a 4017, and a bunch of home grown Vactrols!
Never got around to it though. _________________ What makes a space ours, is what we put there, and what we do there.
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
Posted: Fri Aug 07, 2009 3:51 pm Post subject:
Very interesting! It should be unique-sounding at audio rate switching! _________________ We are selling emotions, there are no emotions in a grid. -mwagener
"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
You can nick my name for this idea if you want.
I was going to call my incarnation of it a "Frequencer".
Are you gonna post any details about the controller board?
Schems? _________________ What makes a space ours, is what we put there, and what we do there.
Are you gonna post any details about the controller board? Schems?
TekniK wrote:
nice,but would be great to have a smoother morph possibility ,would be great for moving soundscapes..
i am still thinking about the 'how'. as mentioned before the boards does not work that well for others than pulse waves, so i want to redesign it.
however, the unit should be clock controlled. and how could i handle this? thinking about the timing with changing cross-fade times?
i fear i will have to incorporate 8VCAs and ARs the clock would trigger a 4017, that would provide the gates for the ARs, which control the VCAs...
and how to implement ONE attack and ONE release control potentiometer for ALL ARs? OTAs? _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
i think one manual morph overlap control and external cv input for all stages would be already very cool
donth know how to,check this doepfer module
Quote:
Module A-144 is a control voltage modifier that is used in combination with the voltage controlled mixer A-135 in the first place. From a linear increasing voltage at the input the module derives four displaced triangle output voltages. When these 4 outputs are connected to the four control voltage inputs of the A-135 one obtains a fading over of the four A-135 audio inputs ("morphing"). The Morphing can be controlled manual and modulated with an external control voltage (e.g. from LFO, ADSR, Random, MIDI-to-CV, Theremin, Light-to-CV, analog sequencer) with attenuator.
Applications: voltage controlled morphing of 4 audio signals in combination with A-135, e.g. morphing between the 4 waveform outputs of an VCA (sawtooth/ rectangle/ triangle/ sine) or the 4 filter outputs of the multimode filter A-121 (lowpass/ bandpass/ highpass/ notch) or the 4 filter outputs of the A-105 (6/12/18/24dB) to obtain a filter with voltage controlled slope.
ofcource this is just a fixed morph,no variable overlap time (so not ideal for rhythmic in sync sequences),and if u will be able to sync it right in tempo with something else is another question!
Anyhow if u would made something like this (4 or 8 stage sequential variable morph time device) it would stand as a seperate module to.
It's the old trade off between heaps of modules and the ability to patch them like this or not, and making it a "one trick pony" module which only does this function.
You need to weigh up whether you can make it a "one trick pony" which justifies locking away 8 filters, 8 VCAs, and 8 ARs for this single function.
Personally, I wouldn't lock all of those components into this single task unless you can get it to do something which the individual components patched together can't.
Which leaves the other option of making it more specialised, but a simpler design. Like, just adding a way of slowing the cross fade between filters. Maybe vactrols? But that would be expensive. But not if you rolled your own? Maybe.
And then how complicated do you want the sequencer section/control board to be?
What about a single filter with vactrols on it's VCs which have their own gate bus on a simple 8 position sequence? It would make it a lot simpler, for roughly the same result. Sort of a beefed up Event Horizon. _________________ What makes a space ours, is what we put there, and what we do there.
BTW,
I'm in a similar position at the moment 'cos I'm playing with these MN3205 delays, and I don't know if I should build all three of them into a BBD reverb type of "one trick pony", or if I should build them into separate modules with the option of patching them together. _________________ What makes a space ours, is what we put there, and what we do there.
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the clock would trigger a 4017, that would provide the gates for the ARs, which control the VCAs...
