Cytomic CF100 Discrete OTA JH VCF for VCVRack

[andy-cytomic]

edit: The product is finished and can be purchased at the VCV Rack Library page. And here is the product info page:

https://cytomic.com/vcv-rack-modules



I've finished the DSP for my Discrete OTA JH VCF module for VCVRack, which I'll release as soon as the final graphics are done, hopefully before the end of next week. (edit) It will be USD 15.

It's a fully discrete version of the classic SSM2040 cascade filter found in the early Prophet 5, and the "JH" in the name is because it's based off the incredible schematic created by Jürgen Haible, was a legend in the synth DIY community:
http://jhaible.com/legacy/tonline_stuff/jh2040.gif

Some of his other incredible projects are here:
http://jhaible.com/legacy/additional_schemos.html

I've added a few more features, including multiples output responses, and 0dB +6dB and +12dB selectable input and output boost amounts for more flexible gain staging into the filter and into a clipping opamp at the output.

Here are the responses:
LP4 = Low Pass 4 pole -24dB/Oct
LP2 = Low Pass 2 pole -12dB/Oct
BP4 = Band Pass 4 pole -12dB/Oct on each side
HP2 = High Pass 2 pole -12dB/Oct
NPN2 = Notch Peak Notch filter with a -12dB/Oct notch one octave down, and one octave up from the cutoff frequency

Until the final graphics are delivered and I do a release here are some demo videos of it in action - right click and open the link in a new tab / window to view:
https://cytomic.com/files/forums/cf100- ... -demo1.mp4
https://cytomic.com/files/forums/cf100- ... -demo1.mp4

[kmonkey]

Amazing

[zerocrossing]

How much will this cost?

[andy-cytomic]

How much will this cost?

USD 15

[andy-cytomic]

A couple of new audio demos:
https://cytomic.com/files/forums/cf100- ... -growl.mp3
https://cytomic.com/files/forums/cf100- ... wobble.mp3

[suthnear]

Will this model be added to the drop at some point? Not expecting it, btw, just curious as I am a fan of this particular filter

[andy-cytomic]

Will this model be added to the drop at some point? Not expecting it, btw, just curious as I am a fan of this particular filter

I hope to in the future when I update The Drop to support VST3 and Apple Silicon. At that time I'll need to update a bunch of the models to the latest circuit solver I'm using, so I can tackle this one at the same time.

[suthnear]

That's fantastic. Thanks

[Henry Von Wilheimer]

Sounds beautiful. The Wasp filter released last year is great and i'm very glad Andy is back in VCV land as Cytomic, so he can potentially release all kinds of filters and cool stuff. I appreciate all of it since I try to stay in VCV as much as possible.

Any chance of being able to edit this filter's schematic like in the newer version of The Scream later on down the line? I don't even know if that would be possible in the same way as I know pretty much nothing about circuits, but it would be fun to be able to tinker with the sound of it in that way. It's awesome as it is though, that would just be icing on the cake.

[Urs]

Wow! Can't wait!

[andy-cytomic]

I hacked Unison into the VCV Rack MIDI to CV converter

[Video] right click and open in new tab to view:
https://cytomic.com/files/forums/cf100-unison.mp4

[andy-cytomic]

Sounds beautiful. The Wasp filter released last year is great and i'm very glad Andy is back in VCV land as Cytomic, so he can potentially release all kinds of filters and cool stuff. I appreciate all of it since I try to stay in VCV as much as possible.

Any chance of being able to edit this filter's schematic like in the newer version of The Scream later on down the line? I don't even know if that would be possible in the same way as I know pretty much nothing about circuits, but it would be fun to be able to tinker with the sound of it in that way. It's awesome as it is though, that would just be icing on the cake.

Full editing of the schematic is something I'd like to add in The Drop, but it may be a bit much for inside VCV Rack since the User Interface side of things is totally different, so would require rewriting the entire thing, and there just isn't a market for such things. What I think is more practical would be some sort of component randomisation panel, as that doesn't take much room.

[Henry Von Wilheimer]

A component randomization panel with a vast number of permutations would be awesome. Ideally with a way to save and reuse seeds in some way, such that one can continue using sweet spots that they find and even share them with others if they want.

I can certainly see there not being much of a market for the full schematic editing, and considering the effort required to implement it in VCV, it may not be worth it. Maybe a higher percentage of VCV users would be interested in that than the general plugin market though, just considering the type of person who tends to be drawn to modular. If you decided to try it out, one possibility could be offering an "enhanced" edition of modules at a higher price while still keeping the originals.

Either way, it's exciting stuff!

[andy-cytomic]

New audio demo of the cf100 doing stereo base filtering:
https://cytomic.com/files/forums/cf100-base-stereo.mp3

Also the user interface graphics are coming along nicely. Should be ready for a release mid to late next week.

[andy-cytomic]

I'm pleased to announce the CF100 is ready for sale for USD 15 from the VCV Rack Library. Here is the info page with a BUY NOW link

https://cytomic.com/vcv-rack-modules