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Thanks! It really is a great design, full of ambience and really enjoyable tone. I'm definitely one of those people who couldn't ever be satisfied with one single delay pedal, not yet any how, but this one would be in my top 3 or 4.

This never fails to make my heart race a bit....

This that...is that a picture of what heaven looks like?

Someone of a DIY Facebook group I belong to contacted CoolAudio, they're still making chips and don't have any plans to stop production of delay chips anytime soon. Have you contacted CoolAudio themselves? This is a pretty nasty rumor to be spreading otherwise (one I'm guilty of propagating myself )

I still want to sub out the standard PCB that everyone uses for the taptation (pin 6 through digipot to ground) and make one that allows for an exact swap out of the delay time pot instead.

If someone wants to donate a taptation kit, I'll gladly try it out.

I hope to grab a few of the ZPSDX myself, I hope that's a big part of the order!

Those are beautiful builds! Do you make the etch mask, then spray paint, then remove the mask?

I'm not sure it would be that simple, if it really is SPI output passed through the chip, you might still have to fiddle with the CS, and if the microcontroller expects an acknowledgement, you'd be out of luck.

I emailed the Tone God a while ago, be we heard anything back from him...

Way to take time to hang out with your son! It restores me faith in humanity to see such stuff go on.

I love playing music with my little girls (I've got 4 of them)!

Great looking build too! How does it sound? I've been debating between this and the Quasar.

Awesome! Another thanks to Brian and the fine folks here who selflessly help strangers on the interwebz.

Neil. Bet you couldn't guess that.

I totally agree, I think Brian is one of the niftiest guys out there, spreading experience, knowledge and cheer through pedal building.

...and I honestly didn't know that Brian shared his library. Would it be anything but completely tasteless to ask for a link or source here? 

I found this to be very enlightening!

http://www.artmondo.net/printworks/articles/ferric.htm

Thanks everyone!

I'll have to look tomorrow, all the pots have "pot condoms" on right now, except for the rate knob, so I don't think there's any shorting from them, but I'll take a look more tomorrow.

The etch was a total accident. I meant to do a nice, simple etch like I've seen many times before. I block sanded the box with 360 up to about 2000 in grits. I then ironed on my blue press and peel mask.

I then taped off the sides and bottom, and dunked the box face down.

There was a pretty serious reaction that ramped up pretty quickly, definitely exothermic. It was rather scary, it was bubbling and the box was getting too hot to touch, and the etchant was steaming...

I pulled it out after...5 minutes? 10 minutes? Maybe 4 minutes. I didn't look too precisely at the clock. I pulled it out and found that the mask had been melted or came off in the violence of the reaction, but when I used 0000 steel wool on it, it seemed to have removed the mask edges first, working its way inward as it etched down, so the lettering has a very angular bevel to it. Amazingly cool in person.

I'm not sure why the etchant reacted the way it did, but I added a bit of water a while back when I found it was crystallizing a bit, and adding water seemed to bring back its potency. It also has been used to etch a few copper circuit boards. I'm wondering if the "trick" was watered, slightly "coppery" etchant being in contact with freshly exposed aluminum. I'm going to consult with my chemical engineer brother, and I'll be trying to repeat the results. I'll report back (and put in a few more board orders!)

Thanks! It's just some OSB that I had laying around from a home improvement project. I put some polyurethane on it, mounted some handles from the drawer section and used some none-slip rubber feet on the bottom, then put strips of Velcro on it. Nothing fancy, but I think it looks nice and is great for the times I don't want to deal with my PRPro. I think this summer I'll make a slightly larger one. ...or buy a PT Jr.