====== Installation of SVX_Hat Board ======

First you need to enable the corresponding driver for the SVX_Hat board. Edit /boot/config.txt as follows.
Add or uncomment the following lines:

  # Enable WM8731 codec
  dtparam=i2c_arm=on
  dtparam=i2s=on
  dtoverlay=i2s-mmap
  dtoverlay=rpi-proto
  
Optionally you can disable the onboard sound card by commenting the following line:

  # Enable audio (loads snd_bcm2835)
  #dtparam=audio=on

Save the file and reboot the Raspberry Pi to enable the SVX_Hat. After reboot open alsamixer (and select the second sound card in case you did not disable the onboard sound card). Make sure to unmute the channel named //Output Mixer HiFi//. Otherwise the card will not play any sound. 

In order to record sound you may also need to enable the line in input in the capture controls.