diff --git a/core/libs/prx/libSceCustomMusicAudioOut/Export.cpp b/core/libs/prx/libSceCustomMusicAudioOut/Export.cpp
index 04ed029ae6..d152ff1067 100644
--- a/core/libs/prx/libSceCustomMusicAudioOut/Export.cpp
+++ b/core/libs/prx/libSceCustomMusicAudioOut/Export.cpp
@@ -16,6 +16,10 @@ int APS5_VABI sceCustomMusicAudioOutGetAllMusicVolume() {
     return 0;
 }
 
+int APS5_VABI sceCustomMusicAudioOutGetLastOutputTime() {
+    NotImplemented_nid_no_patch(__func__);
+}
+
 int APS5_VABI sceCustomMusicAudioOutGetMuted() {
     NotImplemented_nid_no_patch(__func__);
     return 0;
@@ -26,9 +30,25 @@ int APS5_VABI sceCustomMusicAudioOutGetVolume() {
     return 0;
 }
 
+int APS5_VABI sceCustomMusicAudioOutInitialize() {
+    NotImplemented_nid_no_patch(__func__);
+}
+
+int APS5_VABI sceCustomMusicAudioOutOutput() {
+    NotImplemented_nid_no_patch(__func__);
+}
+
 int APS5_VABI sceCustomMusicAudioOutSetAllMusicVolume() {
     NotImplemented_nid_no_patch(__func__);
     return 0;
 }
+int APS5_VABI sceCustomMusicAudioOutSetMuted() {
+    NotImplemented_nid_no_patch(__func__);
+}
+
+int APS5_VABI sceCustomMusicAudioOutSetVolume() {
+    NotImplemented_nid_no_patch(__func__);
+}
+
 
 }
diff --git a/core/libs/prx/libSceCustomMusicAudioOut/include/Api.hpp b/core/libs/prx/libSceCustomMusicAudioOut/include/Api.hpp
index 934f42befc..24a61c1c32 100644
--- a/core/libs/prx/libSceCustomMusicAudioOut/include/Api.hpp
+++ b/core/libs/prx/libSceCustomMusicAudioOut/include/Api.hpp
@@ -6,8 +6,13 @@ extern "C" {
 
 int APS5_VABI sceCustomMusicAudioOutFinalize();
 int APS5_VABI sceCustomMusicAudioOutGetAllMusicVolume();
+int APS5_VABI sceCustomMusicAudioOutGetLastOutputTime();
 int APS5_VABI sceCustomMusicAudioOutGetMuted();
 int APS5_VABI sceCustomMusicAudioOutGetVolume();
+int APS5_VABI sceCustomMusicAudioOutInitialize();
+int APS5_VABI sceCustomMusicAudioOutOutput();
 int APS5_VABI sceCustomMusicAudioOutSetAllMusicVolume();
+int APS5_VABI sceCustomMusicAudioOutSetMuted();
+int APS5_VABI sceCustomMusicAudioOutSetVolume();
 
 }
diff --git a/docs/dev/debt/libSceCustomMusicAudioOut.md b/docs/dev/debt/libSceCustomMusicAudioOut.md
index 15ca7e3fa5..c0fff727bc 100644
--- a/docs/dev/debt/libSceCustomMusicAudioOut.md
+++ b/docs/dev/debt/libSceCustomMusicAudioOut.md
@@ -3,3 +3,5 @@
 ### Unknown function info
 
 - [sceCustomMusicAudioOutFinalize, sceCustomMusicAudioOutGetAllMusicVolume, sceCustomMusicAudioOutGetMuted, sceCustomMusicAudioOutGetVolume and sceCustomMusicAudioOutSetAllMusicVolume](../../../core/libs/prx/libSceCustomMusicAudioOut/Export.cpp) (libSceCustomMusicAudioOut) - names and NIDs are present in the [PS5 3.20 export inventory](https://github.com/DNNDHH/PS5-3.20_Libs/blob/b2a77c09cd71c01f34c790cfbe98c751a13262ad/libSceCustomMusicAudioOut.c), but no credible prototypes were found. The declarations have no parameters solely to resolve known imports; this is not an ABI claim and callers must not call them until signatures are verified
+
+- [sceCustomMusicAudioOutGetLastOutputTime, sceCustomMusicAudioOutInitialize, sceCustomMusicAudioOutOutput, sceCustomMusicAudioOutSetMuted, sceCustomMusicAudioOutSetVolume](../../../core/libs/prx/libSceCustomMusicAudioOut/Export.cpp) throw through `NotImplemented_nid_no_patch`. Names and NIDs are bound by the [13.60 firmware inventory](https://github.com/xdCloudy/PS5-13.60-Function-Stub-Library/blob/bfec40deb4c47a17d7603ee2bc79aa6862c0c56b/data/firmware-13.60/libscecustommusicaudioout-b0940f5719.jsonl); signatures and behaviour remain unknown. Parameterless `int` declarations are import-resolution placeholders, not confirmed ABI signatures. Their service behaviour is unimplemented.