I'm not able to hear any audio through the headphones. I'm using the audio example sketches, such as ToneSweep and Guitar. They don't give any errors and the serial outputs seem to be what's expected. I've tested with multiple headphones. I've uploaded other sketches to the Teensy (the blinking LED one) and that worked.
It's a Teensy 4.0 with the Rev C version of the audio shield. I'm using Mac.
Here's my setup:
It's a Teensy 4.0 with the Rev C version of the audio shield. I'm using Mac.
Here's my setup: