diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 3e3af3300..fb51ce908 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -6668,6 +6668,11 @@ bool FurnaceGUI::loop() {
                 e->song.ins[curIns]->fm.op[i].rr=15;
                 e->song.ins[curIns]->fm.op[i].tl=127;
                 e->song.ins[curIns]->fm.op[i].dt=3;
+
+            e->song.ins[curIns]->esfm.op[i].ct=0;
+            e->song.ins[curIns]->esfm.op[i].dt=0;
+            e->song.ins[curIns]->esfm.op[i].modIn=0;
+            e->song.ins[curIns]->esfm.op[i].outLvl=0;
               }
             }