That's fair. I have some experience in manufacturing engineering; in retrospect, I got a little too excited about how it was designed to be put together in mass

That's fair. I have some experience in manufacturing engineering; in retrospect, I got a little too excited about how it was designed to be put together in mass quantities. After rolling it around in my hands for a few weeks, I've noticed a few warts in the circuit board - extra flux around the solder pads, a PCB throughhole that was a little too close to the board edge, and got a little shorn when the PCB was milled out, other little things like that. In all honesty, there's nothing really superlative about the electronics themselves. The JRC4558 is a really, really old opamp. It was brand new around the time The Who were getting airlifted to Woodstock. I shot you an email about some of the other aspects of the article that I didn't want to write about in open air. Check your inbox!