FINALLY fix useCore

src/main/java/land/chipmunk/chipmunkmod/mixin/ClientConnectionAccessor.java

@@ -0,0 +1,12 @@
+package land.chipmunk.chipmunkmod.mixin;
+
+import net.minecraft.network.ClientConnection;
+import net.minecraft.network.listener.PacketListener;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+@Mixin(ClientConnection.class)
+public interface ClientConnectionAccessor {
+    @Accessor("packetListener")
+    PacketListener packetListener ();
+}

src/main/java/land/chipmunk/chipmunkmod/mixin/ClientConnectionInvoker.java

@@ -0,0 +1,15 @@
+package land.chipmunk.chipmunkmod.mixin;
+
+import net.minecraft.network.ClientConnection;
+import net.minecraft.network.listener.PacketListener;
+import net.minecraft.network.packet.Packet;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Invoker;
+
+@Mixin(ClientConnection.class)
+public interface ClientConnectionInvoker {
+    @Invoker("handlePacket")
+    static <T extends PacketListener> void handlePacket (Packet<T> packet, PacketListener listener) {
+        throw new AssertionError();
+    }
+}

src/main/java/land/chipmunk/chipmunkmod/mixin/ClientPlayNetworkHandlerAccessor.java

@@ -1,6 +1,7 @@
 package land.chipmunk.chipmunkmod.mixin;
 
 import net.minecraft.client.network.PlayerListEntry;
+import net.minecraft.network.ClientConnection;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.gen.Accessor;
 import net.minecraft.text.Text;
@@ -14,6 +15,9 @@ public interface ClientPlayNetworkHandlerAccessor {
   @Accessor("CHAT_VALIDATION_FAILED_TEXT")
   static Text chatValidationFailedText () { throw new AssertionError(); }
 
+  @Accessor("connection")
+  ClientConnection connection();
+
   @Accessor("playerListEntries")
   Map<UUID, PlayerListEntry> playerListEntries();
 

src/main/java/land/chipmunk/chipmunkmod/modules/SongPlayer.java

@@ -1,5 +1,8 @@
 package land.chipmunk.chipmunkmod.modules;
 
+import land.chipmunk.chipmunkmod.mixin.ClientConnectionAccessor;
+import land.chipmunk.chipmunkmod.mixin.ClientConnectionInvoker;
+import land.chipmunk.chipmunkmod.mixin.ClientPlayNetworkHandlerAccessor;
 import land.chipmunk.chipmunkmod.song.Note;
 import land.chipmunk.chipmunkmod.song.Song;
 import land.chipmunk.chipmunkmod.song.SongLoaderException;
@@ -13,15 +16,17 @@ import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer;
 import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.network.ClientPlayNetworkHandler;
 import net.minecraft.client.network.ClientPlayerEntity;
+import net.minecraft.network.packet.s2c.play.PlaySoundS2CPacket;
+import net.minecraft.registry.entry.RegistryEntry;
 import net.minecraft.sound.SoundCategory;
 import net.minecraft.sound.SoundEvent;
 import net.minecraft.text.Text;
 import net.minecraft.util.Identifier;
+import net.minecraft.util.math.random.Random;
 
 import java.io.File;
 import java.net.URL;
 import java.nio.file.Path;
-import java.util.Arrays;
 import java.util.LinkedList;
 import java.util.Timer;
 import java.util.TimerTask;
@@ -141,7 +146,7 @@ public class SongPlayer {
             }
         };
 
-        playTimer.schedule(playTask, 50, 50);
+        playTimer.schedule(playTask, 60, 50);
 
         if (currentSong != null) currentSong.play();
     }
@@ -211,15 +216,31 @@ public class SongPlayer {
             final float floatingPitch = MathUtilities.clamp((float) (0.5 * (Math.pow(2, ((note.pitch + (pitch / 10)) / 12)))), 0F, 2F);
 
             try {
-                if (!useCore) {
+                if (!useCore && client.player != null) {
-                    if (floatingPitch < 0 || floatingPitch > 2) return;
-
                     final String[] thing = note.instrument.sound.split(":");
 
                     if (thing[1] == null) return; // idk if this can be null but ill just protect it for now i guess
 
-                    client.player.playSound(SoundEvent.of(Identifier.of(thing[0], thing[1])), SoundCategory.RECORDS, note.volume, floatingPitch);
+                    final ClientPlayNetworkHandlerAccessor networkHandlerAccessor = (ClientPlayNetworkHandlerAccessor) client.getNetworkHandler();
-                } else CommandCore.INSTANCE.run("execute as " + SELECTOR + " at @s run playsound " + note.instrument.sound + " record @s ~ ~ ~ " + note.volume + " " + floatingPitch);
+
+                    final ClientConnectionAccessor clientConnectionAccessor = (ClientConnectionAccessor) networkHandlerAccessor.connection();
+
+                    ClientConnectionInvoker.handlePacket(
+                            new PlaySoundS2CPacket(
+                                    RegistryEntry.of(SoundEvent.of(Identifier.of(thing[0], thing[1]))),
+                                    SoundCategory.RECORDS,
+                                    client.player.getX(),
+                                    client.player.getY(),
+                                    client.player.getZ(),
+                                    note.volume,
+                                    floatingPitch,
+                                    Random.create().nextLong()
+                            ),
+                            clientConnectionAccessor.packetListener()
+                    );
+                } else {
+                    CommandCore.INSTANCE.run("execute as " + SELECTOR + " at @s run playsound " + note.instrument.sound + " record @s ~ ~ ~ " + note.volume + " " + floatingPitch);
+                }
             } catch (Exception e) {
                 e.printStackTrace();
             }

src/main/resources/chipmunkmod.mixins.json

@@ -21,7 +21,9 @@
     "ElderGuardianAppearanceParticleMixin",
     "IdentifierMixin",
     "DecoratedPotBlockEntitySherdsMixin",
-    "TextMixin"
+    "TextMixin",
+    "ClientConnectionInvoker",
+    "ClientConnectionAccessor"
   ],
   "injectors": {
     "defaultRequire": 1