Firmware update improves audio out

📝NOTE: This was originally in FIRMWARE_UPDATE.md. This has not been tested yet: The analogue audio out quality of the RPi3 is horrible. Learn more about the impact of the firmware update in the raspberry forum. In the same forum you can find information on the firmaware update effect on the analogue audio out. If you were to try to update the firmware, now would be the right moment. I tried the firmware update successfully, but haven't yet built a Phoniebox on top of it. So if you are new to the RPi, skip the following lines and go to the next chapter, configuring your keyboard.

Open a terminal window and update the firmware typing:

sudo rpi-update

Then reboot the machine:

sudo reboot

Now open the terminal window again. The howto suggests to switch off the HDMI audio out:

amixer cset numid=3 1

Open the config file with:

sudo nano /boot/config.txt

and add the following line:

audio_pwm_mode=2

Better safe than sorry, reboot the machine once more:

sudo reboot