From what I read you need an external interface if you want to use the board. The cable is just passing the audio signal through USB if I'm not mistaken (i.e. no Analog-to-digital conversion happening there--mac doing it for you I guess)
From what I read you need an external interface if you want to use the board. The cable is just passing the audio signal through USB if I'm not mistaken (i.e. no Analog-to-digital conversion happening there--mac doing it for you I guess)
Not clear to me at all, but I just did a bit of a google to follow up on a thought — do you mean your hypothesis is that it's using the USB-C-specific Audio Accessory mode?
I was not aware that the Mac supported Audio Accessory mode. And the blurb for these cables talks about a sampling rate, which suggests there's a DAC in the USB-C connector end.
(Works well on the Mac, anyway — it is too much fun simply plugging my lap steel into my Mac in a way that would have been complete fantasy when I first started playing electric guitars.)
ETA: OK so it's always time to play guitar, and I plugged it into the Mac, which reports:
Which suggests it's one of these DAC-in-connector boards:https://www.szttgk.com/en/product/conversionaudiomodule.html
It appears as an ordinary USB Audio device in the Sound panel. My likely ignorant surmise as to why it doesn't work on the iPad is that it also presents a (disconnected) output device and this is confusing the iPad. So perhaps it kind of is working but I can never hear it…
The README[1] states that you should connect a usb audio interface to the board, as it runs in host mode
[1] https://github.com/dashersw/coyopedal#everything-else
This cable presents as a USB audio interface, is the point I'm getting at.
Great finds! I'm pretty sure I'll make it work with ESP32-S3 :)