For those using an LCD controller board to convert an Arcade1Up cabinet, instead of using the audio jack on the Raspberry Pi, use the audio out on the controller. There is a
LCD Controller Board for LM270WQ1 SDA2 SDC2 SDD2 Panel 2K HDMI VGA Video Audio | eBay
What is an LCD Controller Board - Digital View blog
AD-0037-LCD Controller Board (AD Board)-Taiwan Screen
Arcade1Up LCD Controller Basics and Troubleshooting - YouTube