diff --git a/src/xenia/kernel/xboxkrnl_audio.cc b/src/xenia/kernel/xboxkrnl_audio.cc
index 6ea55ea6f..21818ca59 100644
--- a/src/xenia/kernel/xboxkrnl_audio.cc
+++ b/src/xenia/kernel/xboxkrnl_audio.cc
@@ -52,22 +52,6 @@ SHIM_CALL XMAReleaseContext_shim(
 }
 
 
-SHIM_CALL XAudioGetVoiceCategoryVolume_shim(
-    PPCContext* ppc_state, KernelState* state) {
-  uint32_t unk_0 = SHIM_GET_ARG_32(0);
-  uint32_t out_ptr = SHIM_GET_ARG_32(1);
-
-  XELOGD(
-      "XAudioGetVoiceCategoryVolume(%.8X, %.8X)",
-      unk_0, out_ptr);
-
-  // Expects a floating point single. Volume %?
-  SHIM_SET_MEM_32(out_ptr, 0);
-
-  SHIM_SET_RETURN(X_ERROR_SUCCESS);
-}
-
-
 SHIM_CALL XAudioGetSpeakerConfig_shim(
     PPCContext* ppc_state, KernelState* state) {
   uint32_t config_ptr = SHIM_GET_ARG_32(0);
@@ -82,6 +66,43 @@ SHIM_CALL XAudioGetSpeakerConfig_shim(
 }
 
 
+SHIM_CALL XAudioGetVoiceCategoryVolumeChangeMask_shim(
+    PPCContext* ppc_state, KernelState* state) {
+  uint32_t driver_ptr = SHIM_GET_ARG_32(0);
+  uint32_t out_ptr = SHIM_GET_ARG_32(1);
+
+  XELOGD(
+      "XAudioGetVoiceCategoryVolumeChangeMask(%.8X, %.8X)",
+      driver_ptr, out_ptr);
+
+  XEASSERT(driver_ptr == 0xAADD1100);
+
+  // Checking these bits to see if any voice volume changed.
+  // I think.
+  SHIM_SET_MEM_32(out_ptr, 0);
+
+  SHIM_SET_RETURN(X_ERROR_SUCCESS);
+}
+
+
+SHIM_CALL XAudioGetVoiceCategoryVolume_shim(
+    PPCContext* ppc_state, KernelState* state) {
+  uint32_t driver_ptr = SHIM_GET_ARG_32(0);
+  uint32_t out_ptr = SHIM_GET_ARG_32(1);
+
+  XELOGD(
+      "XAudioGetVoiceCategoryVolume(%.8X, %.8X)",
+      driver_ptr, out_ptr);
+
+  XEASSERT(driver_ptr == 0xAADD1100);
+
+  // Expects a floating point single. Volume %?
+  SHIM_SET_MEM_32(out_ptr, 0);
+
+  SHIM_SET_RETURN(X_ERROR_SUCCESS);
+}
+
+
 SHIM_CALL XAudioRegisterRenderDriverClient_shim(
     PPCContext* ppc_state, KernelState* state) {
   uint32_t callback_ptr = SHIM_GET_ARG_32(0);
@@ -166,9 +187,11 @@ void xe::kernel::xboxkrnl::RegisterAudioExports(
   // SHIM_SET_MAPPING("xboxkrnl.exe", XMASetInputBufferReadOffset, state);
   // SHIM_SET_MAPPING("xboxkrnl.exe", XMAGetInputBufferReadOffset, state);
 
-  SHIM_SET_MAPPING("xboxkrnl.exe", XAudioGetVoiceCategoryVolume, state);
   SHIM_SET_MAPPING("xboxkrnl.exe", XAudioGetSpeakerConfig, state);
 
+  SHIM_SET_MAPPING("xboxkrnl.exe", XAudioGetVoiceCategoryVolumeChangeMask, state);
+  SHIM_SET_MAPPING("xboxkrnl.exe", XAudioGetVoiceCategoryVolume, state);
+
   SHIM_SET_MAPPING("xboxkrnl.exe", XAudioRegisterRenderDriverClient, state);
   SHIM_SET_MAPPING("xboxkrnl.exe", XAudioUnregisterRenderDriverClient, state);
   SHIM_SET_MAPPING("xboxkrnl.exe", XAudioSubmitRenderDriverFrame, state);