diff --git a/src/audio.h b/src/audio.h
index ce8bb0cefb..517d185d3c 100644
--- a/src/audio.h
+++ b/src/audio.h
@@ -3,6 +3,9 @@
 
 #include "common.h"
 
+struct UnkAlA9C;
+struct UnkAl19E0;
+
 typedef void (*UnkFuncAl)();
 
 typedef struct UnkAl1 {
@@ -59,7 +62,9 @@ typedef struct UnkAl0 {
 } UnkAl0;
 
 typedef struct UnkAl6CC {
-    /* 0x000 */ char unk_00[0x34];
+    /* 0x000 */ struct UnkAl19E0* unk_00;
+    /* 0x004 */ char unk_04[0x2C];
+    /* 0x030 */ s32 unk_30;
     /* 0x034 */ s32 unk_34;
     /* 0x038 */ s32 unk_38;
     /* 0x03C */ s32 unk_3C;
@@ -68,9 +73,20 @@ typedef struct UnkAl6CC {
     /* 0x04A */ s16 unk_4A;
     /* 0x04C */ char unk_4C[0x10];
     /* 0x05C */ s32 unk_5C;
-    /* 0x060 */ char unk_60[0x5A];
+    /* 0x060 */ s32 unk_60;
+    /* 0x064 */ char unk_64[0x20];
+    /* 0x084 */ s8 unk_84;
+    /* 0x085 */ s8 unk_85;
+    /* 0x086 */ s8 unk_86;
+    /* 0x087 */ s8 unk_87;
+    /* 0x088 */ s8 unk_88;
+    /* 0x089 */ s8 unk_89;
+    /* 0x08A */ s8 unk_8A;
+    /* 0x08B */ s8 unk_8B;
+    /* 0x08C */ char unk_8C[0x2E];
     /* 0x0BA */ s16 unk_BA;
-    /* 0x0BC */ char unk_BC[0x2];
+    /* 0x0BC */ u8 unk_BC;
+    /* 0x0BD */ u8 unk_BD;
     /* 0x0BE */ u8 unk_BE;
     /* 0x0BF */ char unk_BF[0x1];
     /* 0x0C0 */ s8 unk_C0;
@@ -166,8 +182,6 @@ typedef struct UnkAl19E0Sub2 {
     /* 0x2 */ char unk_02[2];
 } UnkAl19E0Sub2;
 
-struct UnkAlA9C;
-
 typedef struct UnkAl19E0Sub3 {
     /* 0x00 */ struct UnkAlA9C* unk_0;
     /* 0x04 */ s8 unk_4;
@@ -342,8 +356,12 @@ extern s32 D_800A3FF0;
 
 void al_LoadBKHeaders(UnkAl19E0* arg0, ALHeap* arg1);
 
+void func_8004B440(UnkAl6CC*, u8, u8, UnkAl19E0*, s32);
+void func_8004B62C(UnkAl6CC*);
+void func_8004B698(UnkAl6CC*);
 void func_8004B6D8(UnkAl6CC*, s32, s16, s16, u8);
 void func_8004B748(UnkAl6CC*);
+s32 func_8004B9E4(UnkAl6CC*, s32);
 void func_8004BA54(UnkAl6CC*, s32);
 void func_8004D510(UnkAlA9C*);
 void func_8004DAA8(UnkAlA9C*);
@@ -356,6 +374,7 @@ void func_800532F4(UnkAl30*);
 void func_80053370(UnkAl12*);
 void func_800533A8(UnkAl2*);
 void func_80053654(UnkAl19E0*);
+void func_80053974(s32*, s32, s32, s16);
 void func_80053A18(UnkAl1*);
 void func_80053A28(s32);
 void func_80053A98(u8, u16, s32);
diff --git a/src/code_25f00_len_940.c b/src/code_25f00_len_940.c
index cef286d1a7..7b36a5c16c 100644
--- a/src/code_25f00_len_940.c
+++ b/src/code_25f00_len_940.c
@@ -16,7 +16,8 @@ void nuAuPreNMIFuncSet(NUAuPreNMIFunc func) {
 
 INCLUDE_ASM(s32, "code_25f00_len_940", func_8004AE08);
 
-INCLUDE_ASM(s32, "code_25f00_len_940", nuAuDmaCallBack);
+s32 nuAuDmaCallBack(s32 addr, s32 len, void* state);
+INCLUDE_ASM(s32, "code_25f00_len_940", nuAuDmaCallBack, s32 addr, s32 len, void* state);
 
 ALDMAproc nuAuDmaNew(NUDMAState **state) {
     if (!nuAuDmaState.initialized) {
diff --git a/src/code_26840_len_20d0.c b/src/code_26840_len_20d0.c
index c618a53b86..5527d7e4be 100644
--- a/src/code_26840_len_20d0.c
+++ b/src/code_26840_len_20d0.c
@@ -1,17 +1,17 @@
 #include "common.h"
 #include "audio.h"
 
-INCLUDE_ASM(s32, "code_26840_len_20d0", func_8004B440);
+INCLUDE_ASM(void, "code_26840_len_20d0", func_8004B440, UnkAl6CC* arg0, u8 arg1, u8 arg2, UnkAl19E0* arg3, s32 arg4);
 
-INCLUDE_ASM(s32, "code_26840_len_20d0", func_8004B62C);
+INCLUDE_ASM(void, "code_26840_len_20d0", func_8004B62C, UnkAl6CC* arg0);
 
-INCLUDE_ASM(s32, "code_26840_len_20d0", func_8004B698);
+INCLUDE_ASM(void, "code_26840_len_20d0", func_8004B698, UnkAl6CC* arg0);
 
 INCLUDE_ASM(void, "code_26840_len_20d0", func_8004B6D8, UnkAl6CC* arg0, s32 arg1, s16 arg2, s16 arg3, u8 arg4);
 
 INCLUDE_ASM(void, "code_26840_len_20d0", func_8004B748, UnkAl6CC* arg0);
 
-INCLUDE_ASM(s32, "code_26840_len_20d0", func_8004B9E4);
+INCLUDE_ASM(s32, "code_26840_len_20d0", func_8004B9E4, UnkAl6CC* arg0, s32 arg1);
 
 void func_8004BA54(UnkAl6CC* arg0, s32 arg1) {
     if (arg1 == 0) {
diff --git a/src/code_2e230_len_2190.c b/src/code_2e230_len_2190.c
index 8e456dfeaa..fe31911a64 100644
--- a/src/code_2e230_len_2190.c
+++ b/src/code_2e230_len_2190.c
@@ -365,7 +365,7 @@ void func_800538C4(UnkAl48* arg0, s32 arg1) { // type may be wrong but it seems
 
 INCLUDE_ASM(s32, "code_2e230_len_2190", func_800538F8);
 
-INCLUDE_ASM(s32, "code_2e230_len_2190", func_80053974);
+INCLUDE_ASM(void, "code_2e230_len_2190", func_80053974, s32* arg0, s32 arg1, s32 arg2, s16 arg3);
 
 void func_80053A18(UnkAl1* arg0) {
     arg0->unk_0A = 0;
@@ -481,9 +481,9 @@ INCLUDE_ASM(s32, "code_2e230_len_2190", func_80054C84);
 
 INCLUDE_ASM(void, "code_2e230_len_2190", func_80054CE0, s32 arg0, s32 arg1);
 
-s32 func_80054D74(s32 arg0) {
+s32 func_80054D74(s32 arg0, s32 arg1) {
     if (arg0 & 0x10) {
-        return func_8004B9E4(D_8009A640);
+        return func_8004B9E4(D_8009A640, arg1);
     }
     return 0;
 }