diff --git a/Source/Core/Core/HW/DSPHLE/UCodes/AX.cpp b/Source/Core/Core/HW/DSPHLE/UCodes/AX.cpp
index 93cd3e5d63..f1f716390a 100644
--- a/Source/Core/Core/HW/DSPHLE/UCodes/AX.cpp
+++ b/Source/Core/Core/HW/DSPHLE/UCodes/AX.cpp
@@ -364,37 +364,18 @@ AXMixControl AXUCode::ConvertMixerControl(u32 mixer_control)
 
 void AXUCode::SetupProcessing(u32 init_addr)
 {
-  u16 init_data[0x20];
-
-  for (u32 i = 0; i < 0x20; ++i)
-    init_data[i] = HLEMemory_Read_U16(init_addr + 2 * i);
-
-  // List of all buffers we have to initialize
-  int* buffers[] = {m_samples_main_left, m_samples_main_right, m_samples_main_surround,
-                    m_samples_auxA_left, m_samples_auxA_right, m_samples_auxA_surround,
-                    m_samples_auxB_left, m_samples_auxB_right, m_samples_auxB_surround};
-
-  u32 init_idx = 0;
-  for (auto& buffer : buffers)
-  {
-    s32 init_val = (s32)((init_data[init_idx] << 16) | init_data[init_idx + 1]);
-    s16 delta = (s16)init_data[init_idx + 2];
-
-    init_idx += 3;
-
-    if (!init_val)
-    {
-      memset(buffer, 0, 5 * 32 * sizeof(int));
-    }
-    else
-    {
-      for (u32 j = 0; j < 32 * 5; ++j)
-      {
-        buffer[j] = init_val;
-        init_val += delta;
-      }
-    }
-  }
+  const std::array<BufferDesc, 9> buffers = {{
+      {m_samples_main_left, 32},
+      {m_samples_main_right, 32},
+      {m_samples_main_surround, 32},
+      {m_samples_auxA_left, 32},
+      {m_samples_auxA_right, 32},
+      {m_samples_auxA_surround, 32},
+      {m_samples_auxB_left, 32},
+      {m_samples_auxB_right, 32},
+      {m_samples_auxB_surround, 32},
+  }};
+  InitMixingBuffers<5 /*ms*/>(init_addr, buffers);
 }
 
 void AXUCode::DownloadAndMixWithVolume(u32 addr, u16 vol_main, u16 vol_auxa, u16 vol_auxb)
diff --git a/Source/Core/Core/HW/DSPHLE/UCodes/AX.h b/Source/Core/Core/HW/DSPHLE/UCodes/AX.h
index 1405379cd0..52adc73b63 100644
--- a/Source/Core/Core/HW/DSPHLE/UCodes/AX.h
+++ b/Source/Core/Core/HW/DSPHLE/UCodes/AX.h
@@ -18,6 +18,7 @@
 #include "Common/CommonTypes.h"
 #include "Common/Swap.h"
 #include "Core/HW/DSPHLE/UCodes/UCodes.h"
+#include "Core/HW/Memmap.h"
 
 namespace DSP::HLE
 {
@@ -141,6 +142,33 @@ protected:
   virtual void HandleCommandList();
   void SignalWorkEnd();
 
+  struct BufferDesc
+  {
+    int* ptr;
+    int samples_per_milli;
+  };
+
+  template <int Millis, size_t BufCount>
+  void InitMixingBuffers(u32 init_addr, const std::array<BufferDesc, BufCount>& buffers)
+  {
+    std::array<u16, 3 * BufCount> init_array;
+    Memory::CopyFromEmuSwapped(init_array.data(), init_addr, sizeof(init_array));
+    for (size_t i = 0; i < BufCount; ++i)
+    {
+      const BufferDesc& buf = buffers[i];
+      s32 value = s32((u32(init_array[3 * i]) << 16) | init_array[3 * i + 1]);
+      s16 delta = init_array[3 * i + 2];
+      if (value == 0)
+      {
+        memset(buf.ptr, 0, Millis * buf.samples_per_milli * sizeof(int));
+      }
+      else
+      {
+        for (int j = 0; j < Millis * buf.samples_per_milli; ++j)
+          buf.ptr[j] = value + j * delta;
+      }
+    }
+  }
   void SetupProcessing(u32 init_addr);
   void DownloadAndMixWithVolume(u32 addr, u16 vol_main, u16 vol_auxa, u16 vol_auxb);
   void ProcessPBList(u32 pb_addr);
diff --git a/Source/Core/Core/HW/DSPHLE/UCodes/AXWii.cpp b/Source/Core/Core/HW/DSPHLE/UCodes/AXWii.cpp
index 161d86234c..e1a7530c35 100644
--- a/Source/Core/Core/HW/DSPHLE/UCodes/AXWii.cpp
+++ b/Source/Core/Core/HW/DSPHLE/UCodes/AXWii.cpp
@@ -253,18 +253,7 @@ void AXWiiUCode::HandleCommandList()
 
 void AXWiiUCode::SetupProcessing(u32 init_addr)
 {
-  // TODO: should be easily factorizable with AX
-  s16 init_data[60];
-
-  for (u32 i = 0; i < 60; ++i)
-    init_data[i] = HLEMemory_Read_U16(init_addr + 2 * i);
-
-  // List of all buffers we have to initialize
-  struct
-  {
-    int* ptr;
-    u32 samples;
-  } buffers[] = {
+  const std::array<BufferDesc, 20> buffers = {{
       {m_samples_main_left, 32}, {m_samples_main_right, 32}, {m_samples_main_surround, 32},
       {m_samples_auxA_left, 32}, {m_samples_auxA_right, 32}, {m_samples_auxA_surround, 32},
       {m_samples_auxB_left, 32}, {m_samples_auxB_right, 32}, {m_samples_auxB_surround, 32},
@@ -272,29 +261,9 @@ void AXWiiUCode::SetupProcessing(u32 init_addr)
 
       {m_samples_wm0, 6},        {m_samples_aux0, 6},        {m_samples_wm1, 6},
       {m_samples_aux1, 6},       {m_samples_wm2, 6},         {m_samples_aux2, 6},
-      {m_samples_wm3, 6},        {m_samples_aux3, 6}};
-
-  u32 init_idx = 0;
-  for (auto& buffer : buffers)
-  {
-    s32 init_val = (s32)((init_data[init_idx] << 16) | init_data[init_idx + 1]);
-    s16 delta = (s16)init_data[init_idx + 2];
-
-    init_idx += 3;
-
-    if (!init_val)
-    {
-      memset(buffer.ptr, 0, 3 * buffer.samples * sizeof(int));
-    }
-    else
-    {
-      for (u32 j = 0; j < 3 * buffer.samples; ++j)
-      {
-        buffer.ptr[j] = init_val;
-        init_val += delta;
-      }
-    }
-  }
+      {m_samples_wm3, 6},        {m_samples_aux3, 6},
+  }};
+  InitMixingBuffers<3 /*ms*/>(init_addr, buffers);
 }
 
 void AXWiiUCode::AddToLR(u32 val_addr, bool neg)