That's a digital CPU/DSP running at tens of MHz, max 55 MHz.

It has got nothing to do with what audio it happens to output.

Each power pin has one small capacitor right at the IC for all power pins.

Maybe not for an audio circuit, but that's not an audio circuit.

That's a digital CPU/DSP running at tens of MHz, max 55 MHz.

It has got nothing to do with what audio a built-in oversampling sigma-delta DAC happens to output.

Each power pin has one small capacitor right at the IC for all power pins.