KORG PA4X 76 - Manual (Page 841)

Connecting audio devices to the audio inputs |837
Enabling the line audio input for MP3 recording
▪ Go to the Global > Audio & Video > Audio In page, and be sure the Audio In
parameter is set to Line .
▪ In the same page, be sure the Audio Out parameter is set to L + R .
This will send the line inputs to the internal MP3 recorder, and disconnects
the Mic input.