Audio through HDMI only. Want to use GPIO for audio.

[/RaspberryPi]

I am setting up a raspberry to play random videos using omxplayer, similar to the Simpsons TV build (https://withrow.io/simpsons-tv-build-guide-waveshare). However I am using a pi 3b and a 3.5" HDMI display instead (http://www.lcdwiki.com/3.5inch_HDMI_Display-B). My os is a lite version of raspbian.

I want to use the GPIO for audio to make it as compact as possible. However I can only get the audio to work on the 3.5 jack on the LCD board. I am assuming this is coming from the HDMI.

I have added "dtparam=audio=on" and "dtoverlay=audremap,enable_jack,pins_18_19" to the config file, and "raspi-gpio set 18 op dl" and "raspi-gpio set 19 op a5" to rc.local.

I have also tried all the audio output options in raspi-config and nothing changes. The audio only comes out of the jack on the LCD board.
submitted by /u/TwelfTundra
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Source: https://www.reddit.com/r/raspberry_pi/c ... for_audio/