MinecraftForge/patches.mcp/minecraft/net/minecraft/block/BlockNote.java.patch

--- ../src-base/minecraft/net/minecraft/block/BlockNote.java
+++ ../src-work/minecraft/net/minecraft/block/BlockNote.java
@@ -58,7 +58,9 @@
             if (tileentity instanceof TileEntityNote)
             {
                 TileEntityNote tileentitynote = (TileEntityNote)tileentity;
+                int old = tileentitynote.note;
                 tileentitynote.changePitch();
+                if (old == tileentitynote.note) return false;
                 tileentitynote.triggerNote(worldIn, pos);
                 playerIn.triggerAchievement(StatList.field_181735_S);
             }
@@ -98,6 +100,10 @@
 
     public boolean onBlockEventReceived(World worldIn, BlockPos pos, IBlockState state, int eventID, int eventParam)
     {
+        net.minecraftforge.event.world.NoteBlockEvent.Play e = new net.minecraftforge.event.world.NoteBlockEvent.Play(worldIn, pos, state, eventParam, eventID);
+        if (net.minecraftforge.common.MinecraftForge.EVENT_BUS.post(e)) return false;
+        eventID = e.instrument.ordinal();
+        eventParam = e.getVanillaNoteId();
         float f = (float)Math.pow(2.0D, (double)(eventParam - 12) / 12.0D);
         worldIn.playSoundEffect((double)pos.getX() + 0.5D, (double)pos.getY() + 0.5D, (double)pos.getZ() + 0.5D, "note." + this.getInstrument(eventID), 3.0F, f);
         worldIn.spawnParticle(EnumParticleTypes.NOTE, (double)pos.getX() + 0.5D, (double)pos.getY() + 1.2D, (double)pos.getZ() + 0.5D, (double)eventParam / 24.0D, 0.0D, 0.0D, new int[0]);