SD / I2S example not working

Hey, guys!

After a lot of trial & error, I was able to get the board online & an external SD initialized OK via a breakout. Everything seems to work fine, other than actually hearing the audio play over the call - only silence is heard, even though the WAV file is recognized OK and even the duration is correct.

I've even tried this example "as-is" and the result is the same.

Can anybody confirm this?

Any help would be greatly appreciated!

Quick update - turns out there's a bunch of settings to get right when exporting from Audacity in order to get this working. Found a sample in the example which got me on the right track.