diff --git a/first_diff.py b/first_diff.py
index fff96557a1..3b8a9dd46a 100755
--- a/first_diff.py
+++ b/first_diff.py
@@ -93,7 +93,7 @@ def search_rom_address(target_addr):
             rom = ram - ram_offset 
             sym = line.split()[-1]
     
-            if "0x" in sym:
+            if sym.startswith("0x"):
                 ram_offset = None
                 continue
             if "/" in sym:
@@ -139,7 +139,7 @@ def parse_map(map_fname):
             rom = ram - ram_offset
             sym = line.split()[-1]
 
-            if "0x" in sym:
+            if sym.startswith("0x"):
                 ram_offset = None
                 continue
             elif "/" in sym:
diff --git a/include/functions.h b/include/functions.h
index 9f715a1385..3051f1618e 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -906,8 +906,8 @@ void Environment_AdjustLights(GlobalContext* globalCtx, f32 arg1, f32 arg2, f32
 s32 Environment_GetBgsDayCount(void);
 void Environment_ClearBgsDayCount(void);
 s32 Environment_GetTotalDays(void);
-void func_800775F0(u16);
-s32 func_80077600(void);
+void Environment_ForcePlaySequence(u16);
+s32 Environment_IsForcedSequenceDisabled(void);
 void func_80077624(GlobalContext* globalCtx);
 void func_80077684(GlobalContext* globalCtx);
 void Environment_WarpSongLeave(GlobalContext* globalCtx);
diff --git a/include/sequence.h b/include/sequence.h
index 2c77087e2c..2b6cc46664 100644
--- a/include/sequence.h
+++ b/include/sequence.h
@@ -1,10 +1,10 @@
-#ifndef BGM_H
-#define BGM_H
+#ifndef SEQUENCE_H
+#define SEQUENCE_H
 
 #define NA_BGM_STOP 0x100000FF
 
 #define NA_BGM_GENERAL_SFX 0x0       // General Sound Effects
-#define NA_BGM_NATURE_BACKGROUND 0x1 // Environmental nature background sounds
+#define NA_BGM_NATURE_AMBIENCE 0x1   // Environmental nature background sounds
 #define NA_BGM_FIELD_LOGIC 0x2       // Hyrule Field
 #define NA_BGM_FIELD_INIT 0x3        // Hyrule Field	Initial Segment From Loading Area
 #define NA_BGM_FIELD_MOVE_1 0x4      // Hyrule Field	Moving Segment 1
diff --git a/include/z64.h b/include/z64.h
index e15c9e2bb9..fbe0112531 100644
--- a/include/z64.h
+++ b/include/z64.h
@@ -185,10 +185,9 @@ typedef struct {
 } View; // size = 0x128
 
 typedef struct {
-    /* 0x00 */ u8   seqIndex;
-    /* 0x01 */ u8   nightSeqIndex;
-    /* 0x02 */ char unk_02[0x2];
-} SoundContext; // size = 0x4
+    /* 0x00 */ u8   seqId;
+    /* 0x01 */ u8   natureAmbienceId;
+} SequenceContext; // size = 0x2
 
 typedef struct {
     /* 0x00 */ s32 enabled;
@@ -1138,7 +1137,7 @@ typedef struct GlobalContext {
     /* 0x00790 */ Camera* cameraPtrs[NUM_CAMS];
     /* 0x007A0 */ s16 activeCamera;
     /* 0x007A2 */ s16 nextCamera;
-    /* 0x007A4 */ SoundContext soundCtx;
+    /* 0x007A4 */ SequenceContext sequenceCtx;
     /* 0x007A8 */ LightContext lightCtx;
     /* 0x007B8 */ FrameAdvanceContext frameAdvCtx;
     /* 0x007C0 */ CollisionContext colCtx;
diff --git a/include/z64save.h b/include/z64save.h
index 7cb6193c86..982da9d5c5 100644
--- a/include/z64save.h
+++ b/include/z64save.h
@@ -135,8 +135,8 @@ typedef struct {
     /* 0x13D6 */ s16 timerX[2];
     /* 0x13DA */ s16 timerY[2];
     /* 0x13DE */ char unk_13DE[0x0002];
-    /* 0x13E0 */ u8 seqIndex;
-    /* 0x13E1 */ u8 nightSeqIndex;
+    /* 0x13E0 */ u8 seqId;
+    /* 0x13E1 */ u8 natureAmbienceId;
     /* 0x13E2 */ u8 buttonStatus[5];
     /* 0x13E7 */ u8 unk_13E7; // alpha related
     /* 0x13E8 */ u16 unk_13E8; // alpha type?
@@ -157,7 +157,7 @@ typedef struct {
     /* 0x140A */ u8 audioSetting;
     /* 0x140B */ char unk_140B[0x0001];
     /* 0x140C */ u8 zTargetSetting; // 0: Switch; 1: Hold
-    /* 0x140E */ u16 unk_140E; // bgm related
+    /* 0x140E */ u16 forcedSeqId; // immediately start playing the sequence if set
     /* 0x1410 */ u8 unk_1410; // transition related
     /* 0x1411 */ char unk_1411[0x0001];
     /* 0x1412 */ u16 nextCutsceneIndex;
diff --git a/include/z64scene.h b/include/z64scene.h
index f6cbb5ebef..fcdb5fad8c 100644
--- a/include/z64scene.h
+++ b/include/z64scene.h
@@ -157,10 +157,10 @@ typedef struct {
 
 typedef struct {
     /* 0x00 */ u8  code;
-    /* 0x01 */ u8  bgmId;
+    /* 0x01 */ u8  specId;
     /* 0x02 */ char pad[4];
-    /* 0x06 */ u8  nightSeqIndex;
-    /* 0x07 */ u8  seqIndex;
+    /* 0x06 */ u8  natureAmbienceId;
+    /* 0x07 */ u8  seqId;
 } SCmdSoundSettings;
 
 typedef struct {
@@ -513,8 +513,8 @@ typedef enum {
 #define SCENE_CMD_END() \
     { SCENE_CMD_ID_END, 0, CMD_W(0) }
 
-#define SCENE_CMD_SOUND_SETTINGS(audioSessionId, nighttimeSfx, bgmId) \
-    { SCENE_CMD_ID_SOUND_SETTINGS, audioSessionId, CMD_BBBB(0, 0, nighttimeSfx, bgmId) }
+#define SCENE_CMD_SOUND_SETTINGS(specId, natureAmbienceId, seqId) \
+    { SCENE_CMD_ID_SOUND_SETTINGS, specId, CMD_BBBB(0, 0, natureAmbienceId, seqId) }
 
 #define SCENE_CMD_ECHO_SETTINGS(echo) \
     { SCENE_CMD_ID_ECHO_SETTINGS, 0, CMD_BBBB(0, 0, 0, echo) }
diff --git a/src/code/code_800EC960.c b/src/code/code_800EC960.c
index 18c23f141d..b1af38f950 100644
--- a/src/code/code_800EC960.c
+++ b/src/code/code_800EC960.c
@@ -2809,7 +2809,7 @@ void AudioDebug_ProcessInput(void) {
             if (CHECK_BTN_ANY(sDebugPadPress, BTN_A)) {
                 sAudioSndContWork[5] ^= 1;
                 Audio_SeqCmdE01(SEQ_PLAYER_BGM_MAIN, sAudioSndContWork[5]);
-                if (func_800FA0B4(SEQ_PLAYER_BGM_MAIN) != NA_BGM_NATURE_BACKGROUND) {
+                if (func_800FA0B4(SEQ_PLAYER_BGM_MAIN) != NA_BGM_NATURE_AMBIENCE) {
                     Audio_SeqCmd1(SEQ_PLAYER_BGM_MAIN, 0);
                 }
                 Audio_SeqCmd1(SEQ_PLAYER_FANFARE, 0);
@@ -3840,7 +3840,7 @@ void func_800F5BF0(u8 arg0) {
     u16 temp_v0;
 
     temp_v0 = func_800FA0B4(SEQ_PLAYER_BGM_MAIN);
-    if (temp_v0 != NA_BGM_NATURE_BACKGROUND) {
+    if (temp_v0 != NA_BGM_NATURE_AMBIENCE) {
         D_80130628 = temp_v0;
     }
     func_800F6FB4(arg0);
@@ -3934,7 +3934,7 @@ void func_800F5E90(u8 arg0) {
                     }
                     Audio_SetVolScale(SEQ_PLAYER_BGM_SUB, 3, sAudioEnemyVol, phi_t0);
                     Audio_StartSeq(SEQ_PLAYER_BGM_SUB, 10, NA_BGM_ENEMY | 0x800);
-                    if (phi_t1 != NA_BGM_NATURE_BACKGROUND) {
+                    if (phi_t1 != NA_BGM_NATURE_AMBIENCE) {
                         Audio_SetVolScale(SEQ_PLAYER_BGM_MAIN, 3, (0x7F - sAudioEnemyVol) & 0xFF, 0xA);
                         func_800F510C(sAudioEnemyVol);
                     }
@@ -3990,11 +3990,11 @@ void func_800F6114(f32 dist) {
 
             sAudioEnemyVol = ((350.0f - adjDist) * 127.0f) / 350.0f;
             Audio_SetVolScale(SEQ_PLAYER_BGM_SUB, 3, sAudioEnemyVol, 0xA);
-            if (D_8016E750[SEQ_PLAYER_BGM_MAIN].unk_254 != NA_BGM_NATURE_BACKGROUND) {
+            if (D_8016E750[SEQ_PLAYER_BGM_MAIN].unk_254 != NA_BGM_NATURE_AMBIENCE) {
                 Audio_SetVolScale(SEQ_PLAYER_BGM_MAIN, 3, (0x7F - sAudioEnemyVol), 0xA);
             }
         }
-        if (D_8016E750[SEQ_PLAYER_BGM_MAIN].unk_254 != NA_BGM_NATURE_BACKGROUND) {
+        if (D_8016E750[SEQ_PLAYER_BGM_MAIN].unk_254 != NA_BGM_NATURE_AMBIENCE) {
             func_800F510C(sAudioEnemyVol);
         }
     }
@@ -4028,7 +4028,7 @@ void func_800F6268(f32 dist, u16 arg1) {
                     D_8016B9D8++;
                 }
             }
-        } else if ((temp_a0 == NA_BGM_NATURE_BACKGROUND) && ((arg1 & 0xFF) == NA_BGM_LONLON)) {
+        } else if ((temp_a0 == NA_BGM_NATURE_AMBIENCE) && ((arg1 & 0xFF) == NA_BGM_LONLON)) {
             temp_a0 = (s8)(func_800FA0B4(SEQ_PLAYER_BGM_SUB) & 0xFF);
             if ((temp_a0 != (arg1 & 0xFF)) && (D_8016B9D8 < 10)) {
                 func_800F5E18(SEQ_PLAYER_BGM_SUB, NA_BGM_LONLON, 0, 0, 0);
@@ -4151,7 +4151,7 @@ void Audio_SetExtraFilter(u8 filter) {
 
     sAudioExtraFilter2 = filter;
     sAudioExtraFilter = filter;
-    if (D_8016E750[SEQ_PLAYER_BGM_MAIN].unk_254 == NA_BGM_NATURE_BACKGROUND) {
+    if (D_8016E750[SEQ_PLAYER_BGM_MAIN].unk_254 == NA_BGM_NATURE_AMBIENCE) {
         for (i = 0; i < 16; i++) {
             t = i;
             // CHAN_UPD_SCRIPT_IO (seq player 0, all channels, slot 6)
@@ -4275,7 +4275,7 @@ void func_800F6D58(u8 arg0, u8 arg1, u8 arg2) {
     u8 temp_a0;
     u8 i;
 
-    if ((D_8016E750[SEQ_PLAYER_BGM_MAIN].unk_254 != NA_BGM_NATURE_BACKGROUND) && func_800FA11C(1, 0xF00000FF)) {
+    if ((D_8016E750[SEQ_PLAYER_BGM_MAIN].unk_254 != NA_BGM_NATURE_AMBIENCE) && func_800FA11C(1, 0xF00000FF)) {
         sAudioNatureFailed = 1;
         return;
     }
@@ -4316,7 +4316,7 @@ void func_800F6E7C(u16 arg0, u16 arg1) {
         Audio_SeqCmdE01(SEQ_PLAYER_BGM_MAIN, 0);
     }
 
-    Audio_StartSeq(SEQ_PLAYER_BGM_MAIN, 0, NA_BGM_NATURE_BACKGROUND);
+    Audio_StartSeq(SEQ_PLAYER_BGM_MAIN, 0, NA_BGM_NATURE_AMBIENCE);
 
     if (i != 0) {
         Audio_SeqCmdE01(SEQ_PLAYER_BGM_MAIN, 1);
diff --git a/src/code/z_common_data.c b/src/code/z_common_data.c
index f63c9b4af9..fbe01f7c7f 100644
--- a/src/code/z_common_data.c
+++ b/src/code/z_common_data.c
@@ -8,9 +8,9 @@ void SaveContext_Init(void) {
     bzero(&gSaveContext, sizeof(gSaveContext));
     D_8015FA88 = 0;
     D_8015FA8C = 0;
-    gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
-    gSaveContext.nightSeqIndex = 0xFF;
-    gSaveContext.unk_140E = NA_BGM_GENERAL_SFX;
+    gSaveContext.seqId = (u8)NA_BGM_DISABLED;
+    gSaveContext.natureAmbienceId = 0xFF;
+    gSaveContext.forcedSeqId = NA_BGM_GENERAL_SFX;
     gSaveContext.nextCutsceneIndex = 0xFFEF;
     gSaveContext.cutsceneTrigger = 0;
     gSaveContext.chamberCutsceneNum = 0;
diff --git a/src/code/z_game_over.c b/src/code/z_game_over.c
index d8e00faade..e9a0eef644 100644
--- a/src/code/z_game_over.c
+++ b/src/code/z_game_over.c
@@ -62,8 +62,8 @@ void GameOver_Update(GlobalContext* globalCtx) {
 
             gSaveContext.nayrusLoveTimer = 2000;
             gSaveContext.naviTimer = 0;
-            gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
-            gSaveContext.nightSeqIndex = 0xFF;
+            gSaveContext.seqId = (u8)NA_BGM_DISABLED;
+            gSaveContext.natureAmbienceId = 0xFF;
             gSaveContext.eventInf[0] = 0;
             gSaveContext.eventInf[1] = 0;
             gSaveContext.eventInf[2] = 0;
diff --git a/src/code/z_kankyo.c b/src/code/z_kankyo.c
index 6125372013..99d5dffa8f 100644
--- a/src/code/z_kankyo.c
+++ b/src/code/z_kankyo.c
@@ -1922,34 +1922,34 @@ void func_800758AC(GlobalContext* globalCtx) {
     // both lost woods exits on the bridge from kokiri to hyrule field
     if (((void)0, gSaveContext.entranceIndex) == 0x4DE || ((void)0, gSaveContext.entranceIndex) == 0x5E0) {
         func_800F6FB4(4);
-    } else if (((void)0, gSaveContext.unk_140E) != NA_BGM_GENERAL_SFX) {
-        if (!func_80077600()) {
-            Audio_QueueSeqCmd(SEQ_PLAYER_BGM_MAIN << 24 | (s32)((void)0, gSaveContext.unk_140E));
+    } else if (((void)0, gSaveContext.forcedSeqId) != NA_BGM_GENERAL_SFX) {
+        if (!Environment_IsForcedSequenceDisabled()) {
+            Audio_QueueSeqCmd(SEQ_PLAYER_BGM_MAIN << 24 | (s32)((void)0, gSaveContext.forcedSeqId));
         }
-        gSaveContext.unk_140E = NA_BGM_GENERAL_SFX;
-    } else if (globalCtx->soundCtx.seqIndex == NA_BGM_NO_MUSIC) {
-        if (globalCtx->soundCtx.nightSeqIndex == 0x13) {
+        gSaveContext.forcedSeqId = NA_BGM_GENERAL_SFX;
+    } else if (globalCtx->sequenceCtx.seqId == NA_BGM_NO_MUSIC) {
+        if (globalCtx->sequenceCtx.natureAmbienceId == 0x13) {
             return;
         }
-        if (((void)0, gSaveContext.nightSeqIndex) != globalCtx->soundCtx.nightSeqIndex) {
-            func_800F6FB4(globalCtx->soundCtx.nightSeqIndex);
+        if (((void)0, gSaveContext.natureAmbienceId) != globalCtx->sequenceCtx.natureAmbienceId) {
+            func_800F6FB4(globalCtx->sequenceCtx.natureAmbienceId);
         }
-    } else if (globalCtx->soundCtx.nightSeqIndex == 0x13) {
+    } else if (globalCtx->sequenceCtx.natureAmbienceId == 0x13) {
         // "BGM Configuration"
-        osSyncPrintf("\n\n\nBGM設定game_play->sound_info.BGM=[%d] old_bgm=[%d]\n\n", globalCtx->soundCtx.seqIndex,
-                     ((void)0, gSaveContext.seqIndex));
-        if (((void)0, gSaveContext.seqIndex) != globalCtx->soundCtx.seqIndex) {
-            func_800F5550(globalCtx->soundCtx.seqIndex);
+        osSyncPrintf("\n\n\nBGM設定game_play->sound_info.BGM=[%d] old_bgm=[%d]\n\n", globalCtx->sequenceCtx.seqId,
+                     ((void)0, gSaveContext.seqId));
+        if (((void)0, gSaveContext.seqId) != globalCtx->sequenceCtx.seqId) {
+            func_800F5550(globalCtx->sequenceCtx.seqId);
         }
     } else if (((void)0, gSaveContext.dayTime) > 0x4AAA && ((void)0, gSaveContext.dayTime) < 0xB71D) {
-        if (((void)0, gSaveContext.seqIndex) != globalCtx->soundCtx.seqIndex) {
-            func_800F5550(globalCtx->soundCtx.seqIndex);
+        if (((void)0, gSaveContext.seqId) != globalCtx->sequenceCtx.seqId) {
+            func_800F5550(globalCtx->sequenceCtx.seqId);
         }
 
         globalCtx->envCtx.unk_E0 = 1;
     } else {
-        if (((void)0, gSaveContext.nightSeqIndex) != globalCtx->soundCtx.nightSeqIndex) {
-            func_800F6FB4(globalCtx->soundCtx.nightSeqIndex);
+        if (((void)0, gSaveContext.natureAmbienceId) != globalCtx->sequenceCtx.natureAmbienceId) {
+            func_800F6FB4(globalCtx->sequenceCtx.natureAmbienceId);
         }
 
         if (((void)0, gSaveContext.dayTime) > 0xB71C && ((void)0, gSaveContext.dayTime) < 0xCAAC) {
@@ -1961,10 +1961,10 @@ void func_800758AC(GlobalContext* globalCtx) {
         }
     }
 
-    osSyncPrintf("\n-----------------\n", ((void)0, gSaveContext.unk_140E));
-    osSyncPrintf("\n 強制ＢＧＭ=[%d]", ((void)0, gSaveContext.unk_140E)); // "Forced BGM"
-    osSyncPrintf("\n     ＢＧＭ=[%d]", globalCtx->soundCtx.seqIndex);
-    osSyncPrintf("\n     エンブ=[%d]", globalCtx->soundCtx.nightSeqIndex);
+    osSyncPrintf("\n-----------------\n", ((void)0, gSaveContext.forcedSeqId));
+    osSyncPrintf("\n 強制ＢＧＭ=[%d]", ((void)0, gSaveContext.forcedSeqId)); // "Forced BGM"
+    osSyncPrintf("\n     ＢＧＭ=[%d]", globalCtx->sequenceCtx.seqId);
+    osSyncPrintf("\n     エンブ=[%d]", globalCtx->sequenceCtx.natureAmbienceId);
     osSyncPrintf("\n     status=[%d]", globalCtx->envCtx.unk_E0);
 
     Audio_SetEnvReverb(globalCtx->roomCtx.curRoom.echo);
@@ -1977,7 +1977,7 @@ void func_80075B44(GlobalContext* globalCtx) {
             func_800F6D58(86, 1, 0);
             if (globalCtx->envCtx.unk_EE[0] == 0 && globalCtx->envCtx.unk_F2[0] == 0) {
                 osSyncPrintf("\n\n\nNa_StartMorinigBgm\n\n");
-                func_800F5510(globalCtx->soundCtx.seqIndex);
+                func_800F5510(globalCtx->sequenceCtx.seqId);
             }
             globalCtx->envCtx.unk_E0++;
             break;
@@ -1997,7 +1997,7 @@ void func_80075B44(GlobalContext* globalCtx) {
             break;
         case 3:
             if (globalCtx->envCtx.unk_EE[0] == 0 && globalCtx->envCtx.unk_F2[0] == 0) {
-                func_800F6FB4(globalCtx->soundCtx.nightSeqIndex);
+                func_800F6FB4(globalCtx->sequenceCtx.natureAmbienceId);
                 func_800F6D58(1, 1, 1);
             }
             globalCtx->envCtx.unk_E0++;
@@ -2390,25 +2390,25 @@ s32 Environment_GetTotalDays(void) {
     return gSaveContext.totalDays;
 }
 
-void func_800775F0(u16 arg0) {
-    gSaveContext.unk_140E = arg0;
+void Environment_ForcePlaySequence(u16 seqId) {
+    gSaveContext.forcedSeqId = seqId;
 }
 
-s32 func_80077600(void) {
-    s32 ret = false;
+s32 Environment_IsForcedSequenceDisabled(void) {
+    s32 isDisabled = false;
 
-    if (gSaveContext.unk_140E == NA_BGM_DISABLED) {
-        ret = true;
+    if (gSaveContext.forcedSeqId == NA_BGM_DISABLED) {
+        isDisabled = true;
     }
 
-    return ret;
+    return isDisabled;
 }
 
 void func_80077624(GlobalContext* globalCtx) {
-    if (globalCtx->soundCtx.nightSeqIndex == 19) {
+    if (globalCtx->sequenceCtx.natureAmbienceId == 19) {
         func_800F6FB4(5);
     } else {
-        func_800F6FB4(globalCtx->soundCtx.nightSeqIndex);
+        func_800F6FB4(globalCtx->sequenceCtx.natureAmbienceId);
     }
 
     func_800F6D58(14, 1, 1);
@@ -2419,8 +2419,8 @@ void func_80077684(GlobalContext* globalCtx) {
     func_800F6D58(14, 1, 0);
     func_800F6D58(15, 1, 0);
 
-    if (func_800FA0B4(SEQ_PLAYER_BGM_MAIN) == NA_BGM_NATURE_BACKGROUND) {
-        gSaveContext.seqIndex = NA_BGM_NATURE_SFX_RAIN;
+    if (func_800FA0B4(SEQ_PLAYER_BGM_MAIN) == NA_BGM_NATURE_AMBIENCE) {
+        gSaveContext.seqId = NA_BGM_NATURE_SFX_RAIN;
         func_800758AC(globalCtx);
     }
 }
diff --git a/src/code/z_parameter.c b/src/code/z_parameter.c
index c0d674e7cf..03fa51887d 100644
--- a/src/code/z_parameter.c
+++ b/src/code/z_parameter.c
@@ -4160,8 +4160,8 @@ void Interface_Update(GlobalContext* globalCtx) {
             globalCtx->sceneLoadFlag = 0x14;
             gSaveContext.sunsSongState = SUNSSONG_INACTIVE;
             func_800F6964(30);
-            gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
-            gSaveContext.nightSeqIndex = 0xFF;
+            gSaveContext.seqId = (u8)NA_BGM_DISABLED;
+            gSaveContext.natureAmbienceId = 0xFF;
         } else {
             gSaveContext.sunsSongState = SUNSSONG_SPECIAL;
         }
diff --git a/src/code/z_play.c b/src/code/z_play.c
index 7e82bf3b5b..de86b1b2e6 100644
--- a/src/code/z_play.c
+++ b/src/code/z_play.c
@@ -393,8 +393,8 @@ void Gameplay_Init(GameState* thisx) {
 
     Interface_SetSceneRestrictions(globalCtx);
     func_800758AC(globalCtx);
-    gSaveContext.seqIndex = globalCtx->soundCtx.seqIndex;
-    gSaveContext.nightSeqIndex = globalCtx->soundCtx.nightSeqIndex;
+    gSaveContext.seqId = globalCtx->sequenceCtx.seqId;
+    gSaveContext.natureAmbienceId = globalCtx->sequenceCtx.natureAmbienceId;
     func_8002DF18(globalCtx, GET_PLAYER(globalCtx));
     AnimationContext_Update(globalCtx, &globalCtx->animationCtx);
     gSaveContext.respawnFlag = 0;
@@ -479,12 +479,12 @@ void Gameplay_Update(GlobalContext* globalCtx) {
                         if (!(gEntranceTable[globalCtx->nextEntranceIndex + sp6E].field & 0x8000)) { // Continue BGM Off
                             // "Sound initalized. 111"
                             osSyncPrintf("\n\n\nサウンドイニシャル来ました。111");
-                            if ((globalCtx->fadeTransition < 56) && (func_80077600() == 0)) {
+                            if ((globalCtx->fadeTransition < 56) && !Environment_IsForcedSequenceDisabled()) {
                                 // "Sound initalized. 222"
                                 osSyncPrintf("\n\n\nサウンドイニシャル来ました。222");
                                 func_800F6964(0x14);
-                                gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
-                                gSaveContext.nightSeqIndex = 0xFF;
+                                gSaveContext.seqId = (u8)NA_BGM_DISABLED;
+                                gSaveContext.natureAmbienceId = 0xFF;
                             }
                         }
                     }
diff --git a/src/code/z_scene.c b/src/code/z_scene.c
index d6fcf566c9..6948d09cc7 100644
--- a/src/code/z_scene.c
+++ b/src/code/z_scene.c
@@ -413,11 +413,11 @@ void func_80099134(GlobalContext* globalCtx, SceneCmd* cmd) {
 
 // Scene Command 0x15: Sound Settings
 void func_80099140(GlobalContext* globalCtx, SceneCmd* cmd) {
-    globalCtx->soundCtx.seqIndex = cmd->soundSettings.seqIndex;
-    globalCtx->soundCtx.nightSeqIndex = cmd->soundSettings.nightSeqIndex;
+    globalCtx->sequenceCtx.seqId = cmd->soundSettings.seqId;
+    globalCtx->sequenceCtx.natureAmbienceId = cmd->soundSettings.natureAmbienceId;
 
-    if (gSaveContext.seqIndex == (u8)NA_BGM_DISABLED) {
-        Audio_QueueSeqCmd(cmd->soundSettings.bgmId | 0xF0000000);
+    if (gSaveContext.seqId == (u8)NA_BGM_DISABLED) {
+        Audio_QueueSeqCmd(cmd->soundSettings.specId | 0xF0000000);
     }
 }
 
diff --git a/src/overlays/actors/ovl_En_Horse_Game_Check/z_en_horse_game_check.c b/src/overlays/actors/ovl_En_Horse_Game_Check/z_en_horse_game_check.c
index f1c379b1cb..245b8c4a2f 100644
--- a/src/overlays/actors/ovl_En_Horse_Game_Check/z_en_horse_game_check.c
+++ b/src/overlays/actors/ovl_En_Horse_Game_Check/z_en_horse_game_check.c
@@ -115,11 +115,11 @@ void EnHorseGameCheck_FinishIngoRace(EnHorseGameCheckIngoRace* this, GlobalConte
             gSaveContext.eventInf[0] = (gSaveContext.eventInf[0] & ~0xF) | 6;
             gSaveContext.eventInf[0] = (gSaveContext.eventInf[0] & ~0x8000) | 0x8000;
             globalCtx->fadeTransition = 3;
-            func_800775F0(NA_BGM_INGO);
+            Environment_ForcePlaySequence(NA_BGM_INGO);
         } else {
             gSaveContext.eventInf[0] = (gSaveContext.eventInf[0] & ~0xF) | 4;
             gSaveContext.eventInf[0] = (gSaveContext.eventInf[0] & ~0x8000) | 0x8000;
-            func_800775F0(NA_BGM_INGO);
+            Environment_ForcePlaySequence(NA_BGM_INGO);
             globalCtx->fadeTransition = 0x2E;
         }
     } else {
diff --git a/src/overlays/actors/ovl_En_In/z_en_in.c b/src/overlays/actors/ovl_En_In/z_en_in.c
index e19acfb3ce..688f218834 100644
--- a/src/overlays/actors/ovl_En_In/z_en_in.c
+++ b/src/overlays/actors/ovl_En_In/z_en_in.c
@@ -630,7 +630,7 @@ void func_80A7A4C8(EnIn* this, GlobalContext* globalCtx) {
         gSaveContext.eventInf[0] = (gSaveContext.eventInf[0] & ~0x000F) | 0x0001;
         gSaveContext.eventInf[0] = (gSaveContext.eventInf[0] & ~0x8000) | 0x8000;
         gSaveContext.infTable[10] &= ~4;
-        func_800775F0(NA_BGM_HORSE);
+        Environment_ForcePlaySequence(NA_BGM_HORSE);
         globalCtx->msgCtx.stateTimer = 0;
         globalCtx->msgCtx.msgMode = MSGMODE_TEXT_CLOSING;
         this->unk_308.unk_00 = 0;
diff --git a/src/overlays/actors/ovl_En_Okarina_Effect/z_en_okarina_effect.c b/src/overlays/actors/ovl_En_Okarina_Effect/z_en_okarina_effect.c
index 1c4c8aaa17..d6ec04bf80 100644
--- a/src/overlays/actors/ovl_En_Okarina_Effect/z_en_okarina_effect.c
+++ b/src/overlays/actors/ovl_En_Okarina_Effect/z_en_okarina_effect.c
@@ -94,7 +94,7 @@ void EnOkarinaEffect_ManageStorm(EnOkarinaEffect* this, GlobalContext* globalCtx
         globalCtx->envCtx.unk_F2[0] = 0;
         if (globalCtx->csCtx.state == CS_STATE_IDLE) {
             func_80077684(globalCtx);
-        } else if (func_800FA0B4(SEQ_PLAYER_BGM_MAIN) == NA_BGM_NATURE_BACKGROUND) {
+        } else if (func_800FA0B4(SEQ_PLAYER_BGM_MAIN) == NA_BGM_NATURE_AMBIENCE) {
             func_800F6D58(0xF, 1, 0);
             func_800F6D58(0xE, 1, 0);
         }
diff --git a/src/overlays/actors/ovl_En_Syateki_Man/z_en_syateki_man.c b/src/overlays/actors/ovl_En_Syateki_Man/z_en_syateki_man.c
index a8d1326941..cf35af98de 100644
--- a/src/overlays/actors/ovl_En_Syateki_Man/z_en_syateki_man.c
+++ b/src/overlays/actors/ovl_En_Syateki_Man/z_en_syateki_man.c
@@ -58,7 +58,7 @@ const ActorInit En_Syateki_Man_InitVars = {
 
 static u16 sBgmList[] = {
     NA_BGM_GENERAL_SFX,
-    NA_BGM_NATURE_BACKGROUND,
+    NA_BGM_NATURE_AMBIENCE,
     NA_BGM_FIELD_LOGIC,
     NA_BGM_DUNGEON,
     NA_BGM_KAKARIKO_ADULT,
diff --git a/src/overlays/actors/ovl_player_actor/z_player.c b/src/overlays/actors/ovl_player_actor/z_player.c
index 4ae609b57a..5c0512ea95 100644
--- a/src/overlays/actors/ovl_player_actor/z_player.c
+++ b/src/overlays/actors/ovl_player_actor/z_player.c
@@ -2824,8 +2824,8 @@ void func_80836448(GlobalContext* globalCtx, Player* this, LinkAnimationHeader*
             globalCtx->gameOverCtx.state = GAMEOVER_DEATH_START;
             func_800F6AB0(0);
             Audio_PlayFanfare(NA_BGM_GAME_OVER);
-            gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
-            gSaveContext.nightSeqIndex = 0xFF;
+            gSaveContext.seqId = (u8)NA_BGM_DISABLED;
+            gSaveContext.natureAmbienceId = 0xFF;
         }
 
         OnePointCutscene_Init(globalCtx, 9806, cond ? 120 : 60, &this->actor, MAIN_CAM);
@@ -3986,8 +3986,8 @@ s32 func_80839034(GlobalContext* globalCtx, Player* this, CollisionPoly* poly, u
                 if (temp == 11) {
                     func_800788CC(NA_SE_OC_SECRET_HOLE_OUT);
                     func_800F6964(5);
-                    gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
-                    gSaveContext.nightSeqIndex = 0xFF;
+                    gSaveContext.seqId = (u8)NA_BGM_DISABLED;
+                    gSaveContext.natureAmbienceId = 0xFF;
                 } else {
                     linearVel = this->linearVelocity;
 
@@ -11923,8 +11923,8 @@ void func_8084E3C4(Player* this, GlobalContext* globalCtx) {
             Environment_WarpSongLeave(globalCtx);
         }
 
-        gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
-        gSaveContext.nightSeqIndex = 0xFF;
+        gSaveContext.seqId = (u8)NA_BGM_DISABLED;
+        gSaveContext.natureAmbienceId = 0xFF;
     }
 }
 
@@ -12440,8 +12440,8 @@ void func_8084F88C(Player* this, GlobalContext* globalCtx) {
         } else {
             globalCtx->fadeTransition = 2;
             gSaveContext.nextTransition = 2;
-            gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
-            gSaveContext.nightSeqIndex = 0xFF;
+            gSaveContext.seqId = (u8)NA_BGM_DISABLED;
+            gSaveContext.natureAmbienceId = 0xFF;
         }
 
         globalCtx->sceneLoadFlag = 0x14;
diff --git a/src/overlays/gamestates/ovl_file_choose/z_file_choose.c b/src/overlays/gamestates/ovl_file_choose/z_file_choose.c
index b9fbf767fb..70561ff539 100644
--- a/src/overlays/gamestates/ovl_file_choose/z_file_choose.c
+++ b/src/overlays/gamestates/ovl_file_choose/z_file_choose.c
@@ -1448,8 +1448,8 @@ void FileChoose_LoadGame(GameState* thisx) {
 
     gSaveContext.respawn[0].entranceIndex = -1;
     gSaveContext.respawnFlag = 0;
-    gSaveContext.seqIndex = 0xFF;
-    gSaveContext.nightSeqIndex = 0xFF;
+    gSaveContext.seqId = (u8)NA_BGM_DISABLED;
+    gSaveContext.natureAmbienceId = 0xFF;
     gSaveContext.showTitleCard = true;
     gSaveContext.dogParams = 0;
     gSaveContext.timer1State = 0;
@@ -1463,7 +1463,7 @@ void FileChoose_LoadGame(GameState* thisx) {
     gSaveContext.healthAccumulator = 0;
     gSaveContext.unk_13F0 = 0;
     gSaveContext.unk_13F2 = 0;
-    gSaveContext.unk_140E = 0;
+    gSaveContext.forcedSeqId = NA_BGM_GENERAL_SFX;
     gSaveContext.skyboxTime = 0;
     gSaveContext.nextTransition = 0xFF;
     gSaveContext.nextCutsceneIndex = 0xFFEF;
diff --git a/src/overlays/gamestates/ovl_select/z_select.c b/src/overlays/gamestates/ovl_select/z_select.c
index ee5ef30c70..2d2be81846 100644
--- a/src/overlays/gamestates/ovl_select/z_select.c
+++ b/src/overlays/gamestates/ovl_select/z_select.c
@@ -32,8 +32,8 @@ void Select_LoadGame(SelectContext* this, s32 entranceIndex) {
     gSaveContext.entranceIndex = entranceIndex;
     gSaveContext.respawnFlag = 0;
     gSaveContext.respawn[RESPAWN_MODE_DOWN].entranceIndex = -1;
-    gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
-    gSaveContext.nightSeqIndex = 0xFF;
+    gSaveContext.seqId = (u8)NA_BGM_DISABLED;
+    gSaveContext.natureAmbienceId = 0xFF;
     gSaveContext.showTitleCard = true;
     gWeatherMode = 0;
     this->state.running = false;
diff --git a/src/overlays/gamestates/ovl_title/z_title.c b/src/overlays/gamestates/ovl_title/z_title.c
index ade2937a65..4a3df1143b 100644
--- a/src/overlays/gamestates/ovl_title/z_title.c
+++ b/src/overlays/gamestates/ovl_title/z_title.c
@@ -136,8 +136,8 @@ void Title_Main(GameState* thisx) {
     }
 
     if (this->exit) {
-        gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
-        gSaveContext.nightSeqIndex = 0xFF;
+        gSaveContext.seqId = (u8)NA_BGM_DISABLED;
+        gSaveContext.natureAmbienceId = 0xFF;
         gSaveContext.gameMode = 1;
         this->state.running = false;
         SET_NEXT_GAMESTATE(&this->state, Opening_Init, OpeningContext);
diff --git a/sym_info.py b/sym_info.py
index ae70bf0501..ed37d6ce29 100755
--- a/sym_info.py
+++ b/sym_info.py
@@ -64,8 +64,8 @@ def search_address(target_addr):
             ram = int(line[16 : 16 + 18], 0)
             rom = ram - ram_offset 
             sym = line.split()[-1]
-    
-            if "0x" in sym:
+
+            if sym.startswith("0x"):
                 ram_offset = None
                 continue
             if "/" in sym:
@@ -112,7 +112,7 @@ def search_symbol(target_sym):
             rom = ram - ram_offset
             sym = line.split()[-1]
 
-            if "0x" in sym:
+            if sym.startswith("0x"):
                 ram_offset = None
                 continue
             elif "/" in sym: