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Download audremap18.dtbo to your pi
sudo cp audremap18.dtbo /boot/overlays/
sudo nano /boot/config.txt
Add this code
dtoverlay=audremap18,pins_18_19
(audremap18.dtbo just enable gpio18 as pwm audio pin,
This Above code will not enable gpio19 as pwm audio pin,
gpio19 have configured as key START)
Then you need reboot
sudo reboot
After rebooting , You need enable local audio
sudo raspi-config Select System Options -> Audio -> 'headphone'
Then reboot again use sudo reboot
Set audio voice max and play any music then you will hear sound