diff --git a/shared/src/constants/mixerProtocols/LawoRuby.ts b/shared/src/constants/mixerProtocols/LawoRuby.ts
index bd5153db..2deb002a 100644
--- a/shared/src/constants/mixerProtocols/LawoRuby.ts
+++ b/shared/src/constants/mixerProtocols/LawoRuby.ts
@@ -56,6 +56,13 @@ export const LawoRuby: MixerProtocol = {
                         type: 'int',
                         label: 'RR',
                     },
+                    {
+                        mixerMessage:
+                            'Ruby.Sources.{channel}.DSP.Input.LR Mode',
+                        value: 2,
+                        type: 'int',
+                        label: 'MONO',
+                    },
                 ],
                 CHANNEL_OUT_GAIN: [
                     {
@@ -119,6 +126,13 @@ export const LawoRuby: MixerProtocol = {
                         type: 'int',
                         label: 'RR',
                     },
+                    {
+                        mixerMessage:
+                            'Ruby.Sources.{channel}.DSP.Input.LR Mode',
+                        value: 2,
+                        type: 'int',
+                        label: 'MONO',
+                    },
                 ],
                 CHANNEL_OUT_GAIN: [
                     // {