Adafruit VS1053 Codec + MicroSD Breakout - MP3/WAV/MIDI/OGG Play + Record - v4

I'm just trying here with an example raw file I know, and it does seems that I'm not getting any output on the DAC...

However, output via PWM does work for me, so:

analogWrite(A0, 0.5, {freq:20000});
w.startOutput(A0,4000,{repeat:true});

Should actually produce something for you...