Hi,

I have a Luckfox Pico board (https://www.luckfox.com/Luckfox-Pico/EN-Luckfox-Pico). From the schematic, I can see that the audio is broken out onto some testpoints labelled TP1, TP2, TP3.
image.png

However when I feed audio into TP1, it breaks my USB connection leading me to believe TP1, TP2 ...