Linking it here since it's easy to miss. It seems he is using the popularity of this to help a friend recovering from brain surgery, I think this makes this project even more awesome in my book.
Thomann had (still have?) this thing called "stompenberg", where they put up some mechanical switching system so that you could play audio files through the actual pedals in the system, and turn on the knobs / parameters.
In the recent years some smaller businesses have started to offer outboard gear in this way. You upload some stem, and can process it through their hardware remotely, and get back the results.
This is cool except that the only ad for this I've come across so far was for analog summing. Remote or not, that concept (going out of one's way to theoretically have something more pleasing than digital summing) always smelled like a scam to me. Like ok, maybe a sample rate a hair above what Shannon/Nyquist demand can't do digital summing with all the right IM distortion of the missing supersonic content or whatever, but 192kHz ought to solve for that! So is it something else to be gained via analog summing?
They have 60+ rack units with little robot grabbers physically controlling the knobs.
Re analogue summing, yeah it does near nothing in reality. What you're missing though is that what people actually want with analogue summing isn't really technically better sound but technically worse sound. Analogue gear might have a little bit of harmonic distortion, a little bit of crosstalk between channels, certain transformer characteristics etc that theoretically make it sound more glued together or warm etc etc. But ultimately summing is summing and those differences vs. digital are very small (and won't always contribute positively either).
I'm not interested in analog summing myself, but I think you're missing the point. It's not about "better" summing. You want more euphonic summing. Analog audio processing often comes with artefacts that give the signal sent through it a more pleasing character, for whatever reason (phase shift, saturation, channel differences between left and right, transient modulation, slew rate, power sag, etc.).
I personally think analog summing is a waste of time, because the differences are too subtle to be worth the investment in setting it up. But that's just my opinion. Some people are really into it (Eric Valentine comes to mind).
Just wanted to point out that in the context of audio equipment (both professional and audiophile) "sounds better" often means "sounds worse but more engaging". Just like a polaroid picture often evokes more emotions than a photo taken with a modern digital camera and a great lens.
On Firefox/Linux, after allowing mic access, I get a "Failed to access microphone" above the button, and in the javascript console:
[ws] Microphone error: DOMException: AudioContext.createMediaStreamSource: Connecting AudioNodes from AudioContexts with different sample-rate is currently not supported.
I use a Peterson strobe tuner on my smartphone, it's really good.
I've also coded my own strobe tuner to learn more, unfortunately no mobile version yet.
On my Pixel 10 using Chrome, it says "Mic needed - refresh to allow" but refreshing doesn't change anything. It's possible that I did something years ago to prevent whatever permission popup might normally be offered?
Your browser might have microphone access set to "Deny" by default rather than "Ask". This happened to my friend. He changed the setting and it worked, but maybe there's a way to give a more helpful error in this scenario. Let me see