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OK... I'll add audio later :-)

It's done. I bought an old solder gun on ebay and we brought tiny aluminum champaign bottles from our vacation. Other parts are an old XLR Plug, aluminum tubing and an old closet knob. What a fun project. It's mighty loud and even has some cool blinking lights ;-)

Well... technically, any PT2399 or FV-1 based delay is a digital delay. It would be helpful to show the folks here what you have planned so far, so people can check, if an existing design would work...

I built a ray gun circuit once. Only problem is, I was going for a Dr. Quack.

[youtube width=400]https://www.youtube.com/watch?v=mFXCgCJwH7A[/youtube]

That sounds quite convincing as well :-). Please reverse engineer asap.

I will make a PCB for myself and give away the remaining boards. Here is the schematic with my modifications:

Home from vacation, I breadboarded the circuit. I did some changes (pot tapers, ranges etc.) to it and will post an updated schematic once I have finalized it. Here is how it sounds now. It does not create all the sounds of the original ray guns, but does the most recognizable pew-pew-sound pretty well. Tiny remaining problem is, that it takes some time to initially charge up the capacitors (twice in the very beginning of the video). I can live with that, unless somebody has an idea how to pre-charge the caps.

I did some research about the effect, and found some funny stuff, which I thought I'd share:
- the original was created using the modulation lexicon PCM-41 digital delay
- Stevens says, that modified toy ray guns himself to be able to control the oscillator speed
- He also says, that these aren't made any more, so he searches for similar ones on ebay
- Somebody seems to sell clones of these for 149 $ 
- There is a stompbox "Loud Button Electronics WTF Distortion/Low-Frequency Oscillator", that can create some similar sounds

Here are some sources: The links point to the right position in the videos (so you don't have to listen to the complete Vince Neil Song  ):
INTERVIEWS:
Steve Stevens' Rig Rundown, 2013
Ray Gun Demo, 2014

MUSIC:
Billy Idol, Rebel Yell, 1983
Michael Jackson, Dirty Diana, 1987
Steve Stevens, Atomic Playboys, 1989
Vince Neil, Look in Her Eyes, 1992

It's been at least a year since I searched for a ray gun (circuit) that sounds similar to Steve Steven's signature "Rebel Yell" sound (we play that in a cover band). They are impossible to find, most of them are way too digital/modern sounding and cannot be tuned (in terms of LFO rate).

IT seems, my search is over - check this out!

Here is another one with the same circuit.

Setting up a traditional blues / jazz board for a telecaster / matchless Spitfire Combination, that does not need a lot... Zendrive, King of Tone, Aion L5 (Clean Channel), Tap Tempo Tremolo, Alter Ego delay, Hall of Fame Reverb

Not really a Dr. Boogie, but a BSIAB/Okko Mashup, that I did... Just as an inspiration:

https://www.madbeanpedals.com/forum/index.php?topic=27408.msg265388#msg265388

And a video of me playing that thing into a matchless amp: https://www.youtube.com/watch?v=eh4FevjBdWE

I have modified Pickguards, and while it's doable with a lot of patience and swearing, I cannot recommend it (unless you have to do it for a customized pickguard). To get it right, you need a template and a router. I use a 3d printer for templates of pickups and you have to go very slowly, if you dont want the material to chip.

I am glad to hear that, congrats! Seems like the delay Sounds were Not loud enough or the noise Level was too high for taprecise to measure. Cool that it works now!

I double checked my documentation (https://drive.google.com/drive/folders/0B5vtgOg9bRJjVGlIVDZxUUxfSDA), chapter 8. I remember it was kind of tricky to get the modulation running on the 2-PT-version. For the calibration of a 2-PT-Delay, I had to modify the code a bit (downloadable version!), so it might be, that that is the reason, why it isn't running on a 3-PT-Version (what is the complete schematic of that and what design is that - looks awesome and I see a lot of knobs and a microcontroller on your breadboard as well).

While I cannot really help with the 3-PT-Delay: What 2-PT-Design were you using... maybe I can help with that one.

P.S. As you mentioned the USB-Cable in your 1-PT-Design: Are all the GND (Taprecise, Delay etc.) connected to each other? Just an idea...

the receive pin is A0 and that must be working because it calibrates a single pt2399 just fine

OK... I must have missed that the Taprecise Board seems to work on a single pt2399 delay.
.

2 Seconds Rings a Bell... I think that If taprecise does Not receive an Echo within 2 sec, it will Stop the calibration. So, please Check If the echoes make it to the analog Pin (I will Check the Code tomorrow to See which one that is...)

I am really sorry I currently cannot support you better, Leetut. It's been a long time since I built my taprecise and the issues you describe do not remind me of anything I (or others) had to deal with before (there have been quite a few successful builds). Plus, my work load increased due to corona (nothing to complain about, really!), which kept me away from both, music and electronics for weeks...

I have never tried it with a 3PT2399 delay, mine works in a double PT Delay though. Don't see, why this should not work... What comes to my mind: Have you done Arduino programming before? If yes, you could try to write a small piece of code an manually (e.g. via the serial interface) set the resistance of the digipot (just to see if it reacts correctly). Also, you could check (much easier), if the tap tempo button is recognized by the arduino, check for the analog input that receives the echo beeps during calibration etc...