> A Permissions-Policy header is blocking the microphone Your server is sending a header that switches this feature off for the whole page. Look for Permissions-Policy: microphone=() in your host config and allow microphone=(self) instead.
Despite allowing microphone.
I'll come back here later and hopefully the answer fairy will give us a gift of some info on how to fix this...
...Confusingly, the error looks/seems like something to do with the server... But I'm all at sea with this one....
https://om-intelligence.ch/projects/vocal-notation/vocal-not...
The comments mention it is using autocorrelation ACF2+ for pitch detection, and Krumhansl-Schmuckler for key detection. (Which doesn't mean very much to me yet, but is giving me some keywords to start researching.)
I was expecting YIN since that's the first thing Claude reaches for, and the code comments in the source do contain a malformed em-dash....