diff --git a/mml2vgm/CHANGE.txt b/mml2vgm/CHANGE.txt
index 6903419f..33648161 100644
--- a/mml2vgm/CHANGE.txt
+++ b/mml2vgm/CHANGE.txt
@@ -1,4 +1,7 @@
 更新履歴
+TAG756 2024/12/9 2nd
+  Core:PartCounter:mucomDotNETを演奏時、パート順が乱れるのを修正
+
 TAG755 2024/12/9
   Core:XGM2:PCMテーブル生成のバグ修正
 
diff --git a/mml2vgm/mml2vgmIDEx64/form/FrmPartCounter.cs b/mml2vgm/mml2vgmIDEx64/form/FrmPartCounter.cs
index c745cad6..9d5c9a0e 100644
--- a/mml2vgm/mml2vgmIDEx64/form/FrmPartCounter.cs
+++ b/mml2vgm/mml2vgmIDEx64/form/FrmPartCounter.cs
@@ -60,7 +60,7 @@ public partial class FrmPartCounter : DockContent, IForm
         };
 
         private PartRowComparer comparer;
-        private bool requiresSorting=true;
+        private bool requiresSorting=false;
 
 
         public FrmPartCounter(Setting setting)
@@ -447,11 +447,14 @@ private void Timer_Tick(object sender, EventArgs e)
                 }
                 if (r >= mmli.inst.Length) continue;
 
-                if (row.Cells["ClmPriority"].Value == null || (int)row.Cells["ClmPriority"].Value != mmli.partPriority[r])
+                if (
+                    (!(mmli is YM2608_mucom) && !(mmli is YM2610B_mucom) && !(mmli is YM2151_mucom))
+                    && (row.Cells["ClmPriority"].Value == null || (int)row.Cells["ClmPriority"].Value != mmli.partPriority[r]))
                 {
                     row.Cells["ClmPriority"].Value = mmli.partPriority[r];
                     requiresSorting = true;
                 }
+
                 row.Cells["ClmInstrument"].Value = mmli.inst[r] == null ? "-" : mmli.inst[r].ToString();
                 row.Cells["ClmEnvelope"].Value = mmli.envelope[r] == null ? "-" : mmli.envelope[r].ToString();
                 row.Cells["ClmVolume"].Value = mmli.vol[r] == null ? "-" : mmli.vol[r].ToString();