Getting ready to send these off next week to Signal Sounds for distribution along with a restock of the VCO. Actual launch date tbd, but should be a matter of weeks.
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I continued my “Arduino Nano as a delay” -project/challenge. I managed to get a delay of a bit over 2 seconds with audio quality of “I can probably tell what instrument this is” and no information above 3 kHz. Which I have couple of ideas how to improve. But atleast there is no yarring aliased screaming of low bitrate samples. That Arduino has six PWM outputs, so I could have six tap delay with separate feedbacks for them. Input probably needs some limiter circuit to maximize the headroom, which will probably be a diode soft clipper, this thing filters out the high frequency content anyway. Same clipper could also be in the sum of the feedback of the delay taps. And there should be adjustable high pass filter as this seems to have low frequencies that start to oscillate quite quickly. Having internal LFO to modulate the length of the delays would be fun and also probably completely break and distort the audio as DPCM can only be read linearily. Or is this algorithm something like two bit logarithmic adaptive delta pulse code modulation, which has some parameters I again derived with the classic Stetson-Harrison -method.
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that is awesome that you have the ***** to go forward with this [ and to all of you that do ] . I just do paint by numbers, and if it doesn’t immediately work it gets chucked into a box for later …
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Finallly it’s done! 
My Version of an AS3340 VCO with the best of different worlds: I combined @lookmumnocomputer perfomance VCO together with @EddyBergman “Really Good AS3340 VCO” (Eddy Bergman.com: Synthesizer Build part-18: A REALLY GOOD AS3340 VCO DESIGN!!) and added some features of the very good (german) description of the AS3340 from Manfred Lipp. The VCO works with 12V and was easy to calibrate, after I made some changes.
@EddyBergman: You could add a note to the 12V section of your VCO: R11 (in your schematic 1.5MOhm) should be changed to 1.2MOhm in the 12V version, so that Iref will be 10uA. This did the trick, without it I was not able to calibrate it, even with the 300kOhm R4. All other changes work fine.
Fun fact: I connected the 7segment display in reverse order, so I need a mirror to read the notes. I will fix this in Software… 
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looks cool!!! nice mount for the display!!
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Thank you so much for that feedback Stef. That is very useful info. I will certainly add your comments to the article. Also, I was flattered to see my name on your VCO panel. 
Thank you!
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Here’s what I’m working on now:
Bugs of course lol but at least the basic idea is working…
It’s scanning the E_YEAH vowel wavetable from serum…
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Love it!
Crying out for drum style noise consonants.
Keep going
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Got one of them component tester thingamajiggies, which means I finally got around to matching the pairs for @sebastian 's ladder filter.
[edit] How rude of me, posting knobless pictures…
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Today I decided to try looking at things from a different perspective, so I cut some brackets and added them to my 19 inch rack elements:
and stacked the lot like so:
I’m thinking of giving the bottom rack elements an inclination as well, so that when I look down I get a better viewing angle on the lowest panels.
This may look top heavy, but rest assured, it is not.
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Have I asked about these before?
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Not hardware, but I fixed my GitHub Actions server and made some nice docs:
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this is why i dread Dud updates. you just keep building faster than i can scroll
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There I would really like to have built this, but unfortunately it was just a joke for @Jos 's new case
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I know. I was also joking. Your case looks cooler anyway with all the red.
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I have already noticed this several times, that I often get things a little wrong when it comes to second degrees
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