diff --git a/Ryujinx.HLE/HOS/Services/Aud/AudErr.cs b/Ryujinx.HLE/HOS/Services/Aud/AudErr.cs
index cecea86057..675ea8c7c9 100644
--- a/Ryujinx.HLE/HOS/Services/Aud/AudErr.cs
+++ b/Ryujinx.HLE/HOS/Services/Aud/AudErr.cs
@@ -5,5 +5,6 @@ namespace Ryujinx.HLE.HOS.Services.Aud
         public const int DeviceNotFound        = 1;
         public const int UnsupportedRevision   = 2;
         public const int UnsupportedSampleRate = 3;
+        public const int OpusInvalidInput      = 6;
     }
 }
\ No newline at end of file
diff --git a/Ryujinx.HLE/OsHle/Services/Aud/IHardwareOpusDecoder.cs b/Ryujinx.HLE/HOS/Services/Aud/IHardwareOpusDecoder.cs
similarity index 71%
rename from Ryujinx.HLE/OsHle/Services/Aud/IHardwareOpusDecoder.cs
rename to Ryujinx.HLE/HOS/Services/Aud/IHardwareOpusDecoder.cs
index 8ed560fd5b..e1319443ef 100644
--- a/Ryujinx.HLE/OsHle/Services/Aud/IHardwareOpusDecoder.cs
+++ b/Ryujinx.HLE/HOS/Services/Aud/IHardwareOpusDecoder.cs
@@ -1,10 +1,10 @@
 using Concentus.Structs;
-using Ryujinx.HLE.OsHle.Ipc;
+using Ryujinx.HLE.HOS.Ipc;
 using System.Collections.Generic;
 
-using static Ryujinx.HLE.OsHle.ErrorCode;
+using static Ryujinx.HLE.HOS.ErrorCode;
 
-namespace Ryujinx.HLE.OsHle.Services.Aud
+namespace Ryujinx.HLE.HOS.Services.Aud
 {
     class IHardwareOpusDecoder : IpcService
     {
@@ -23,7 +23,8 @@ namespace Ryujinx.HLE.OsHle.Services.Aud
         {
             m_Commands = new Dictionary<int, ServiceProcessRequest>()
             {
-                { 0, DecodeInterleaved }
+                { 0, DecodeInterleaved         },
+                { 4, DecodeInterleavedWithPerf }
             };
 
             this.SampleRate    = SampleRate;
@@ -32,6 +33,17 @@ namespace Ryujinx.HLE.OsHle.Services.Aud
             Decoder = new OpusDecoder(FixedSampleRate, ChannelsCount);
         }
 
+        public long DecodeInterleavedWithPerf(ServiceCtx Context)
+        {
+            long Result = DecodeInterleaved(Context);
+
+            //TODO: Figure out what this value is.
+            //According to switchbrew, it is now used.
+            Context.ResponseData.Write(0L);
+
+            return Result;
+        }
+
         public long DecodeInterleaved(ServiceCtx Context)
         {
             long InPosition = Context.Request.SendBuff[0].Position;
@@ -47,12 +59,12 @@ namespace Ryujinx.HLE.OsHle.Services.Aud
 
             byte[] OpusData = Context.Memory.ReadBytes(InPosition, InSize);
 
-            int Processed = ((OpusData[0] << 0)  |
-                             (OpusData[1] << 8)  |
-                             (OpusData[2] << 16) |
-                             (OpusData[3] << 24)) + 8;
+            int Processed = ((OpusData[0] << 24) |
+                             (OpusData[1] << 16) |
+                             (OpusData[2] << 8)  |
+                             (OpusData[3] << 0)) + 8;
 
-            if (Processed > InSize)
+            if ((uint)Processed > (ulong)InSize)
             {
                 return MakeError(ErrorModule.Audio, AudErr.OpusInvalidInput);
             }
diff --git a/Ryujinx.HLE/OsHle/Services/Aud/IHardwareOpusDecoderManager.cs b/Ryujinx.HLE/HOS/Services/Aud/IHardwareOpusDecoderManager.cs
similarity index 96%
rename from Ryujinx.HLE/OsHle/Services/Aud/IHardwareOpusDecoderManager.cs
rename to Ryujinx.HLE/HOS/Services/Aud/IHardwareOpusDecoderManager.cs
index 4c485313c5..875dc74c34 100644
--- a/Ryujinx.HLE/OsHle/Services/Aud/IHardwareOpusDecoderManager.cs
+++ b/Ryujinx.HLE/HOS/Services/Aud/IHardwareOpusDecoderManager.cs
@@ -1,7 +1,7 @@
-using Ryujinx.HLE.OsHle.Ipc;
+using Ryujinx.HLE.HOS.Ipc;
 using System.Collections.Generic;
 
-namespace Ryujinx.HLE.OsHle.Services.Aud
+namespace Ryujinx.HLE.HOS.Services.Aud
 {
     class IHardwareOpusDecoderManager : IpcService
     {
diff --git a/Ryujinx.HLE/OsHle/Services/Aud/AudErr.cs b/Ryujinx.HLE/OsHle/Services/Aud/AudErr.cs
deleted file mode 100644
index ec5d054ebf..0000000000
--- a/Ryujinx.HLE/OsHle/Services/Aud/AudErr.cs
+++ /dev/null
@@ -1,7 +0,0 @@
-namespace Ryujinx.HLE.OsHle.Services.Aud
-{
-    static class AudErr
-    {
-        public const int OpusInvalidInput = 6;
-    }
-}
\ No newline at end of file