diff --git a/Source/Core/Core/HW/DSPHLE/UCodes/AX.cpp b/Source/Core/Core/HW/DSPHLE/UCodes/AX.cpp
index 21ff955a54..42124939aa 100644
--- a/Source/Core/Core/HW/DSPHLE/UCodes/AX.cpp
+++ b/Source/Core/Core/HW/DSPHLE/UCodes/AX.cpp
@@ -31,8 +31,7 @@ AXUCode::~AXUCode()
 
 void AXUCode::Initialize()
 {
-  m_mail_handler.PushMail(DSP_INIT);
-  DSP::GenerateDSPInterruptFromDSPEmu(DSP::INT_DSP);
+  m_mail_handler.PushMail(DSP_INIT, true);
 
   LoadResamplingCoefficients();
 }
@@ -75,8 +74,7 @@ void AXUCode::LoadResamplingCoefficients()
 void AXUCode::SignalWorkEnd()
 {
   // Signal end of processing
-  m_mail_handler.PushMail(DSP_YIELD);
-  DSP::GenerateDSPInterruptFromDSPEmu(DSP::INT_DSP);
+  m_mail_handler.PushMail(DSP_YIELD, true);
 }
 
 void AXUCode::HandleCommandList()
@@ -620,8 +618,7 @@ void AXUCode::HandleMail(u32 mail)
   else if (mail == MAIL_RESUME)
   {
     // Acknowledge the resume request
-    m_mail_handler.PushMail(DSP_RESUME);
-    DSP::GenerateDSPInterruptFromDSPEmu(DSP::INT_DSP);
+    m_mail_handler.PushMail(DSP_RESUME, true);
   }
   else if (mail == MAIL_NEW_UCODE)
   {
@@ -668,8 +665,7 @@ void AXUCode::Update()
   // Used for UCode switching.
   if (NeedsResumeMail())
   {
-    m_mail_handler.PushMail(DSP_RESUME);
-    DSP::GenerateDSPInterruptFromDSPEmu(DSP::INT_DSP);
+    m_mail_handler.PushMail(DSP_RESUME, true);
   }
 }
 
diff --git a/Source/Core/Core/HW/DSPHLE/UCodes/AXWii.cpp b/Source/Core/Core/HW/DSPHLE/UCodes/AXWii.cpp
index f7cbbcfd3f..7edd9c1d0f 100644
--- a/Source/Core/Core/HW/DSPHLE/UCodes/AXWii.cpp
+++ b/Source/Core/Core/HW/DSPHLE/UCodes/AXWii.cpp
@@ -611,10 +611,7 @@ void AXWiiUCode::OutputSamples(u32 lr_addr, u32 surround_addr, u16 volume, bool
   }
 
   memcpy(HLEMemory_Get_Pointer(lr_addr), buffer, sizeof(buffer));
-
-  // There should be a DSP_SYNC message sent here. However, it looks like not
-  // sending it does not cause any issue, and sending it actually causes some
-  // sounds to go at half speed. I have no idea why.
+  m_mail_handler.PushMail(DSP_SYNC, true);
 }
 
 void AXWiiUCode::OutputWMSamples(u32* addresses)