☺️ thank you so much! I have all of you to thank for allowing me to work in this space!! There’s nothing better than getting nerdy of sound design and science!
Thanks so much! ☺️ I was worried I’d gone to far with the runtime of this video, but I’m overall I think I’m overall very happy with the result. It’s such a fascinating circuit and signal process I just kept the cameras rolling and kept talking! 😂
Thank you for one, making a cool dual APF, but more importantly sharing your exploration of it. While I am sure circuit developers have probably made these or similar explorations before, they are not done with us, the viewers. I enjoyed watching you explore the module as you also understand it as the builder which in more enriching and informative then watching just a user explore it and guessing on what is happening. Great fun. I was sold on the module from another review, but now I need your mixer…. We’ll want it I guess. I should be able to do most of that fun with maths minus the stereo for now. Great stuff.
An all pass filter is is a bandpass filter with variable center (hp+hp) and then shifts the phase of that and mixed together with the original signal (with the filtered band removed from the original signal)? Like a fixed phase modulation but for a specific frequency band? Brain explodes.
great module and great video. when i saw the annoncement for your cartrige for the fx boy i was intrigued but wished for a more flexible, fully featured (stereo) module, and the dapf is exactly that. a must have for me.
Wow very Intruoctional I learn so much from your previous and present module showcases Thank You for all the knowledge Killer Module design I love multi purpose utility modules Cheers Jason
I was just thinking the same thing... I would love one of those! :) -- Would also love to have a version where the front outputs could break the normals of the back outputs... hoping a v2 is coming...
Part th-cam.com/video/9w4LtUd3b6s/w-d-xo.html goes into detail how to achieve 90 degree phase shift for all frequencies. One way to realize this is by a Dome filter, a network of two parallel allpass cascades. A carefully tuned Dome filter can be applied to any signal and realizes a Hilbert transform. This is the basis of analog frequency shifters as explained by Doc Sketchy: th-cam.com/video/yu31TbqDs5g/w-d-xo.htmlsi=OjR1P6RArZiGzowT&t=526
Absolutely! But with the difference that a dome filter applies the phase shift simultaneously across the full spectrum all at once. Which is how in a frequency shifter it’s possible to work with sine/cosine of a complex audio carrier signal. The circle from a sine wave dåpf solution is still only one frequency shifted to a target of 90 degrees at a time. But the 1V/octave tracking allows for this to be done by matching centre frequency to the carrier pitch. The 1V/octave calibration being the element that took me a few attempts. From what I remember, dome filters are a cascade of overlapping bands applying the shift in parallel (although the circuit is in series I think). Am I correct in thinking that per band there will be a centre frequency providing accurate 90 degree points on the spectrum, but the overlap produces approximations? Time to dig out the electronotes frequency shifter sheets for me 😉
Love your modules, I have an Arbhar and Cuir on the way. Will you be doing an input module specifically for instrument level such as guitar with 1/4” inputs or one that accepts guitar pedals easily?
It certainly can! It’s a really fascinating audio process. It’s very much dependent on what the source audio is. Certain complex audio signals can be hugely dramatic in stereo spread effect even with no dynamic modulation. I powerful patch that I like actually goes the opposite way: no harmonics! Using only a sine tone. Dry hard panned left and then phase shifting it to be panned right. This will have dramatically different sonic results depending on if it’s monitored through headphones or on speakers. The physical space plays a big part. As the tones land in a phase cancellation it’ll have that same effect temporarily as wiring a speaker out of phase with the other. Subtle movement of the phase through modulation and it can produce weird effects like walking through standing waves. Localisation of the tone source gets hard to place.
@@instruo headphones are a strange thing anyway, nothing is ever perceived with that much separation and in fact using the phase trick is somewhat closer to what happens in reality. Though using 2 phase delayed sound sources is not exactly like one sound source arriving to the ears at different times. Anyway, this video is very good food for thoughts, a proper meal, I'd say 😁 Don't have one (yet) but I'll be trying out some of the patches on an APF that is in my case. Thanks!
I think there will be similarities. There will be things achieved in DSP that are unique and powerful, and outside of the capabilities of the dåpf. But similarly, having an all-pass filter entirely within the analogue domain will have capabilities outwith the scope of digital. Audio rate modulation for example! The dåpf is very much a building block processor. I think of it a bit like a “module” module 😂 It’s been really fun developing something that is much more traditionally modular! It means it can be inserted in completely unexpected contexts/signal flows :)
Kudos! I was already sold on this, but the final resonant filter patch has bumped up the urgency. I spent a bit of time exploring how to patch this last year - I figured that a passive low pass gate channel could make a crude 1-pole filter, and dumped a pile of spaghetti on every mixer and inverter I had to find interesting things to do with that. The tones you got in that last patch reminded me of some of the unique resonant variable bandwidth tones I stumbled upon, but with a much cleaner interface believe it or not! Patch is here with some notes and timestamps if you're interested: th-cam.com/video/PwdSocSe_ic/w-d-xo.htmlsi=sMWEVP89-LMCIsHS
Never thought I'd spend my Thursday night cracking a couple of cans and watching a video about all-pass filters but here I am
You’re an absolute treasure of the human race and we modular nerds are lucky you committed your energy to our world.
☺️ thank you so much!
I have all of you to thank for allowing me to work in this space!!
There’s nothing better than getting nerdy of sound design and science!
I second this wholeheartedly. Looking forward to adding dapf to my case 🤘🏻
Amen to that 💪🏼🙏🏼
Hard to deside what I love more ,the actual module or the educational content.
Great work Jason ,thanks
Thanks so much! ☺️
I was worried I’d gone to far with the runtime of this video, but I’m overall I think I’m overall very happy with the result.
It’s such a fascinating circuit and signal process I just kept the cameras rolling and kept talking! 😂
The phase on that Rhodes sample sounds amazing.
I always felt that your modules were in the design aesthetic of David Lynch's Dune ❤
Definitely makes standard old waveforms sound warmer, textured and spatial. Well done!
What a beautiful design - so much flexibility without menus or settings
Got my dapf in the mail today and I've been following along to build filters from scratch. Top notch! And it's a perfect partner to the Cs-L ...
Thank you for one, making a cool dual APF, but more importantly sharing your exploration of it. While I am sure circuit developers have probably made these or similar explorations before, they are not done with us, the viewers. I enjoyed watching you explore the module as you also understand it as the builder which in more enriching and informative then watching just a user explore it and guessing on what is happening. Great fun.
I was sold on the module from another review, but now I need your mixer…. We’ll want it I guess. I should be able to do most of that fun with maths minus the stereo for now. Great stuff.
An all pass filter is is a bandpass filter with variable center (hp+hp) and then shifts the phase of that and mixed together with the original signal (with the filtered band removed from the original signal)?
Like a fixed phase modulation but for a specific frequency band?
Brain explodes.
great module and great video. when i saw the annoncement for your cartrige for the fx boy i was intrigued but wished for a more flexible, fully featured (stereo) module, and the dapf is exactly that. a must have for me.
Wow very Intruoctional
I learn so much from your previous and present module showcases
Thank You for all the knowledge
Killer Module design
I love multi purpose utility modules
Cheers Jason
Brilliant video. And I am completely sold on this module. Thank you.
Instruo modular equipment impressed me every day. I am a big fan of your modules. life is too short to make all possibility's of this wonder machine.
An excellent product demonstration to relax/study to.
Absolutely wonderful module, Jason!
Incredible how you managed to put so much functionality and production value in a 4 HP module. Again.
You guys....and I mean that inclusively.....are amazing.
What about that expanded cárn?!? Looks rad. Oh, dåpf also!! :D Congrats on another great addition!!!
👀
I was just thinking the same thing... I would love one of those! :) -- Would also love to have a version where the front outputs could break the normals of the back outputs... hoping a v2 is coming...
The carn in this rack is currently one of two 😋
Here’s a hint though: the actual prototype itself is 4HP. The faceplate however is 12HP!
@instruo I have room to expand mine... ;) Just sayin'
@@instruo Ohhh and here I was thinking what to do with my 4HP free space beside the carn, dammit.
Part th-cam.com/video/9w4LtUd3b6s/w-d-xo.html goes into detail how to achieve 90 degree phase shift for all frequencies. One way to realize this is by a Dome filter, a network of two parallel allpass cascades. A carefully tuned Dome filter can be applied to any signal and realizes a Hilbert transform. This is the basis of analog frequency shifters as explained by Doc Sketchy: th-cam.com/video/yu31TbqDs5g/w-d-xo.htmlsi=OjR1P6RArZiGzowT&t=526
Absolutely!
But with the difference that a dome filter applies the phase shift simultaneously across the full spectrum all at once. Which is how in a frequency shifter it’s possible to work with sine/cosine of a complex audio carrier signal.
The circle from a sine wave dåpf solution is still only one frequency shifted to a target of 90 degrees at a time. But the 1V/octave tracking allows for this to be done by matching centre frequency to the carrier pitch.
The 1V/octave calibration being the element that took me a few attempts.
From what I remember, dome filters are a cascade of overlapping bands applying the shift in parallel (although the circuit is in series I think). Am I correct in thinking that per band there will be a centre frequency providing accurate 90 degree points on the spectrum, but the overlap produces approximations?
Time to dig out the electronotes frequency shifter sheets for me 😉
I have done this with FAUST to great effect. I would like some people to try my FAUST patch.
God damn this thing sounds amazing. Neeeeed it
can someone please run 4-8 of these in series all under the same control and settings with cv? id love to hear some hardware dispersion in action :)
At the beginning of the video I thought you were about to cover Vitamin by Incubus
Love your modules, I have an Arbhar and Cuir on the way. Will you be doing an input module specifically for instrument level such as guitar with 1/4” inputs or one that accepts guitar pedals easily?
😉
Genius!
Nice stereo VCA over there with Carn. Did you build that onto a Carn?
It's a little something I've been toying with ;)
just noticed this too
Roland RSS-10 in Eurorack!
silly question: wouldn't the "stereofication" also happen when using the dry signal on one side and the all pass filtered signal on the other?
It certainly can!
It’s a really fascinating audio process. It’s very much dependent on what the source audio is.
Certain complex audio signals can be hugely dramatic in stereo spread effect even with no dynamic modulation.
I powerful patch that I like actually goes the opposite way: no harmonics! Using only a sine tone. Dry hard panned left and then phase shifting it to be panned right.
This will have dramatically different sonic results depending on if it’s monitored through headphones or on speakers. The physical space plays a big part.
As the tones land in a phase cancellation it’ll have that same effect temporarily as wiring a speaker out of phase with the other.
Subtle movement of the phase through modulation and it can produce weird effects like walking through standing waves.
Localisation of the tone source gets hard to place.
@@instruo headphones are a strange thing anyway, nothing is ever perceived with that much separation and in fact using the phase trick is somewhat closer to what happens in reality. Though using 2 phase delayed sound sources is not exactly like one sound source arriving to the ears at different times. Anyway, this video is very good food for thoughts, a proper meal, I'd say 😁
Don't have one (yet) but I'll be trying out some of the patches on an APF that is in my case. Thanks!
The stereo phasing can very clearly be followed by iphone15pro in landscape position with nose in mid 😂
Is this comparable to the Disperser .vst?
I think there will be similarities.
There will be things achieved in DSP that are unique and powerful, and outside of the capabilities of the dåpf.
But similarly, having an all-pass filter entirely within the analogue domain will have capabilities outwith the scope of digital.
Audio rate modulation for example!
The dåpf is very much a building block processor. I think of it a bit like a “module” module 😂
It’s been really fun developing something that is much more traditionally modular! It means it can be inserted in completely unexpected contexts/signal flows :)
Did anybody else feel like they were along for the ride on a weird magical ship, where the captain is a mad scientist explorer? 10000Hz Under the Sea?
Kudos! I was already sold on this, but the final resonant filter patch has bumped up the urgency.
I spent a bit of time exploring how to patch this last year - I figured that a passive low pass gate channel could make a crude 1-pole filter, and dumped a pile of spaghetti on every mixer and inverter I had to find interesting things to do with that. The tones you got in that last patch reminded me of some of the unique resonant variable bandwidth tones I stumbled upon, but with a much cleaner interface believe it or not!
Patch is here with some notes and timestamps if you're interested: th-cam.com/video/PwdSocSe_ic/w-d-xo.htmlsi=sMWEVP89-LMCIsHS
Allpass are per definition not audible, all resulting waveforms have the exact same harmonics and fundamentals. The difference only occurs in context
Very well put :)
I demonstrate this behaviour specifically, and how to utilise it for audio processing in the latter half of the video.
What have you done now?...
Made a filter which isn't a filter!!! :D
This rack is mouth watering. I just want to touch it! Beautiful. Subbed forever!