diff --git a/configs/alsa/default_alsa_sound.conf b/configs/alsa/default_alsa_sound.conf
index 3c3f8ff..a272d16 100644
--- a/configs/alsa/default_alsa_sound.conf
+++ b/configs/alsa/default_alsa_sound.conf
@@ -444,7 +444,7 @@ state.PinePhone {
 	control.34 {
 		iface MIXER
 		name 'Line Out Source Playback Route'
-		value.0 Stereo
+		value.0 'Mono Differential'
 		value.1 Stereo
 		comment {
 			access 'read write'