Update README.md

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@ -1199,7 +1199,7 @@ Vesrion 2.0: System Default Use the **HDMI** to output audio.
The commands for switching the sound output:
```
amixer cset numid s 3 2
amixer cset numid=3 2
## Set the output here to 2, which is HDMI.
## Setting the output to 1 switch to the analog signal (that is, the headphone connector).