diff --git a/src/engine/platform/su.cpp b/src/engine/platform/su.cpp
index 48d0ba9a1..c2cd6b25e 100644
--- a/src/engine/platform/su.cpp
+++ b/src/engine/platform/su.cpp
@@ -187,6 +187,13 @@ void DivPlatformSoundUnit::tick(bool sysTick) {
       chan[i].control=chan[i].std.ex3.val&15;
       writeControl(i);
     }
+    if (chan[i].std.ex4.had) {
+      chan[i].syncTimer=chan[i].std.ex4.val&65535;
+      chan[i].timerSync=(chan[i].syncTimer>0);
+      chWrite(i,0x1e,chan[i].syncTimer&0xff);
+      chWrite(i,0x1f,chan[i].syncTimer>>8);
+      writeControlUpper(i);
+    }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       //DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_SU);
       chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE);
diff --git a/src/gui/insEdit.cpp b/src/gui/insEdit.cpp
index 25ee330b6..f0d6d3da3 100644
--- a/src/gui/insEdit.cpp
+++ b/src/gui/insEdit.cpp
@@ -3678,6 +3678,7 @@ void FurnaceGUI::drawInsEdit() {
           }
           if (ins->type==DIV_INS_SU) {
             macroList.push_back(FurnaceGUIMacroDesc("Control",&ins->std.ex3Macro,0,4,64,uiColors[GUI_COLOR_MACRO_OTHER],false,NULL,NULL,true,suControlBits));
+            macroList.push_back(FurnaceGUIMacroDesc("Phase Reset Timer",&ins->std.ex4Macro,0,65535,160,uiColors[GUI_COLOR_MACRO_OTHER])); // again reuse code from resonance macro but use ex4 instead
           }
 
           drawMacros(macroList);