diff --git a/main.py b/main.py
index 0ace40b..cd7cc98 100755
--- a/main.py
+++ b/main.py
@@ -139,6 +139,7 @@ class GuiMain:
         self.running = True
 
     def set_knob_value(self, side, index, value):
+        self.knobs_display_side = side
         self.knobs[side][self.fx_mode[side]].set_value(index, value)
 
     def set_fx_mode(self, side, i):