Espruino Pico and SD cards

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Gordon
Have you tried:
```
analogWrite(BUZZER, 0.5, { freq: 40000 } );
```
That'll do PWM on the speaker, but at a frequency above your hearing threshold. You should then be able to hear the actual sound and not the beep?

But as far as docs, maybe you could do something on Frtzing (if there's an SD card part? It could be easier). I guess just adding to the existing File IO page might be fine?

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