I’ve wanted a voltage-controller crossover for years, this is great. I intend to use it to set up different processing chains on different frequency bands, but I’m sure I’ll find other uses too.
I’ve wanted a voltage-controller crossover for years, this is great. I intend to use it to set up different processing chains on different frequency bands, but I’m sure I’ll find other uses too.
I’ve wanted one for a while, too. Multiband processing is often overlooked in hardware, I think.
So I could use this to "break out" three frequencies or frequency bands from a mono synth signal (or use 2 modules for stereo).
Then different processing could be applied to each frequency band.
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That would be good for adding reverb to just the high band signal or a delay to just the baseline.
Or I could use it in my sound system where I have some presently non-used low range amp and speaker sets. (subs)
Place those speakers far away and add some verb to it. Cool
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Now, I have to figure out what to use the voltage control for.
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Of course, this is also a state variable (multi-mode) filter where you can sweep the cut off with a CV.
It just doesn't have adjustable Q (resonance).
In other words a LP, BP, HP filter like say Ripples or Joranalogue filter 8,
but without adjustable resonance so it is probably much cleaner sounding.
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Exponential CV response, I wonder how well does it track the CV?
Foghorn
I'm not sure what's going on, but, well ah crap..what now? .......Not really a musician.......
Of course, this is also a state variable (multi-mode) filter where you can sweep the cut off with a CV.
It just doesn't have adjustable Q (resonance).
In other words a LP, BP, HP filter like say Ripples or Joranalogue filter 8,
but without adjustable resonance so it is probably much cleaner sounding.
In theory, the Linkwitz-Riley curve gives a flat frequency response if the outputs are summed. So yes, using the LR4 as a conventional 4-pole LP, HP, or even a variable-width BP give a pretty clean sound (relative to the input signal).
Hey, looks great! Is it possible to move the crossover points out of the audible range? Like fading in an effect by frequency by moving the upper crossover point down into the actual sound.
Hey, looks great! Is it possible to move the crossover points out of the audible range? Like fading in an effect by frequency by moving the upper crossover point down into the actual sound.
I am not sure I understand the question, so correct me if this does not apply
Both filters (i.e. crossover points) can sweep the entire 20-20k range, so it is possible to overlap the two filter and partially or completely eliminate a certain band. For example, if the low/mid crossover point is 1kHz, and the mid/high crossover point is 500Hz, there will be no output from the "mid" band.
Eliminating a band, patching it into an effect like echo and than slowly 'fade' it in again to let the echo come to full effect.
Ah, ok. Yes, totally possible. For example, a variable-bandwidth bandpass is easy to patch because the CV inputs are normalled, and they each have an inverting attenuator. So, with one CV input, you can make one filter move up in frequency while the other moves down.
Sounds interesting - doing the same just inverted on a second device would open up nice ways for spectral mixing and crossfading. Signals slowly appearing in the midrange of other signals and finally taking over the whole spectrum...
Sounds interesting - doing the same just inverted on a second device would open up nice ways for spectral mixing and crossfading. Signals slowly appearing in the midrange of other signals and finally taking over the whole spectrum...
Well, about 2 years ago I had thought of using a circuit like the one in the LR4 in some sort of multiband processing module. I was thinking multiband compression, overdrive, plus a send/return in one module. Unfortunately, something like that would probably take up a lot of space. After a while I decided to just go ahead with the crossover portion, since any type of multiband processing starts with a crossover.
Nice little effect - a useful building block - & good you're working with Elevator Sound (just down the road from me).
Cheers. I am definitely excited to have La 67 modules offered at Elevator Sound.
The BugBrand crossover has always intrigued--and inspired--me. Along with the Cwejman, it got me thinking about VC crossovers for synths. As you say, a building block for processing audio.
A few people have asked me for an explanation of how the circuit works. I am still preparing the official user guide, but below I have attached a crude version of the block diagram that will appear in that document.
Basically, the high pass output of the first SVF gives the "HI" band. The low pass output of the first SVF is input into the second SVF. The high pass output of the second SVF gives the "MID" band, and the low pass of the second SVF gives the "LO" band.
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