diff --git a/src/game/bondeyespy.c b/src/game/bondeyespy.c
index 4724ba046..7c2e6943e 100644
--- a/src/game/bondeyespy.c
+++ b/src/game/bondeyespy.c
@@ -1058,16 +1058,16 @@ void eyespy_process_input(bool allowbuttons)
 
 		switch (g_EyespyHit) {
 		case EYESPYHIT_BG:
-			snd00010718(NULL, 0, 16000, AL_PAN_CENTER, SFXMAP_808C_EYESPYHIT, 1, 1, -1, 1);
+			snd_start_extra(NULL, false, 16000, AL_PAN_CENTER, SFXMAP_808C_EYESPYHIT, 1, 1, -1, true);
 			break;
 		case EYESPYHIT_OBJ:
-			snd00010718(NULL, 0, 16000, AL_PAN_CENTER, SFXMAP_808C_EYESPYHIT, 1, 1, -1, 1);
+			snd_start_extra(NULL, false, 16000, AL_PAN_CENTER, SFXMAP_808C_EYESPYHIT, 1, 1, -1, true);
 			break;
 		case EYESPYHIT_DOOR:
-			snd00010718(NULL, 0, 16000, AL_PAN_CENTER, SFXMAP_808C_EYESPYHIT, 1, 1, -1, 1);
+			snd_start_extra(NULL, false, 16000, AL_PAN_CENTER, SFXMAP_808C_EYESPYHIT, 1, 1, -1, true);
 			break;
 		case EYESPYHIT_CHR:
-			snd00010718(NULL, 0, 16000, AL_PAN_CENTER, SFXMAP_808C_EYESPYHIT, 1, 1, -1, 1);
+			snd_start_extra(NULL, false, 16000, AL_PAN_CENTER, SFXMAP_808C_EYESPYHIT, 1, 1, -1, true);
 			break;
 		case EYESPYHIT_DAMAGE:
 			snd_start(var80095200, SFXNUM_00F2_PICKUP_LASER, NULL, -1, -1, -1, -1, -1);
diff --git a/src/game/bondgun.c b/src/game/bondgun.c
index bd4cf9758..7158a7ed3 100644
--- a/src/game/bondgun.c
+++ b/src/game/bondgun.c
@@ -674,10 +674,10 @@ void bgun_tick_anim(struct hand *hand, struct modeldef *modeldef)
 							case GUNCMD_PLAYSOUND:
 #if VERSION >= VERSION_NTSC_1_0
 								if (hasspeed) {
-									snd00010718(0, 0, AL_VOL_FULL, AL_PAN_CENTER, cmd->soundnum, speed, 1, -1, 1);
+									snd_start_extra(NULL, false, AL_VOL_FULL, AL_PAN_CENTER, cmd->soundnum, speed, 1, -1, true);
 									hasspeed = false;
 								} else {
-									snd00010718(0, 0, AL_VOL_FULL, AL_PAN_CENTER, cmd->soundnum, 1.0f, 1, -1, 1);
+									snd_start_extra(NULL, false, AL_VOL_FULL, AL_PAN_CENTER, cmd->soundnum, 1.0f, 1, -1, true);
 								}
 #else
 								audiohandle = snd_start(var80095200, cmd->soundnum, NULL, -1, -1, -1, -1, -1);
diff --git a/src/game/bondmove.c b/src/game/bondmove.c
index d5b799be3..9f15711d4 100644
--- a/src/game/bondmove.c
+++ b/src/game/bondmove.c
@@ -1966,7 +1966,7 @@ void bmove_tick(bool allowc1x, bool allowc1y, bool allowc1buttons, bool ignorec2
 				sound = footstep_choose_sound(chr, distance > 10);
 
 				if (sound != -1) {
-					snd00010718(0, 0, AL_VOL_FULL, AL_PAN_CENTER, sound, 1, 1, -1, true);
+					snd_start_extra(NULL, false, AL_VOL_FULL, AL_PAN_CENTER, sound, 1, 1, -1, true);
 				}
 			}
 		}
diff --git a/src/game/lv.c b/src/game/lv.c
index 792e4d84a..0e8254aed 100644
--- a/src/game/lv.c
+++ b/src/game/lv.c
@@ -2209,7 +2209,7 @@ void lv_tick(void)
 					&& g_MiscAudioHandle == NULL
 					&& !lv_is_paused()
 					&& nexttime < TICKS(g_MpTimeLimit60)) {
-				snd00010718(&g_MiscAudioHandle, 0, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_00A3_ALARM_DEFAULT, 1, 1, -1, true);
+				snd_start_extra(&g_MiscAudioHandle, false, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_00A3_ALARM_DEFAULT, 1, 1, -1, true);
 			}
 		}
 
diff --git a/src/game/mplayer/scenarios/hackthatmac.inc b/src/game/mplayer/scenarios/hackthatmac.inc
index 4c0b767ec..91aaa5f2c 100644
--- a/src/game/mplayer/scenarios/hackthatmac.inc
+++ b/src/game/mplayer/scenarios/hackthatmac.inc
@@ -455,7 +455,7 @@ void htm_tick_chr(struct chrdata *chr)
 #else
 						hudmsg_create_with_flags(lang_get(L_MPWEAPONS_019), HUDMSGTYPE_MPSCENARIO, HUDMSGFLAG_ONLYIFALIVE); // "You need to use the Data Uplink."
 #endif
-						snd00010718(NULL, 0, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_01CC, 1, 1, -1, 1);
+						snd_start_extra(NULL, false, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_01CC, 1, 1, -1, true);
 					}
 				}
 			}
@@ -529,7 +529,7 @@ void htm_tick_chr(struct chrdata *chr)
 				hudmsg_create_with_flags(lang_get(L_MPWEAPONS_017), HUDMSGTYPE_MPSCENARIO, HUDMSGFLAG_ONLYIFALIVE);
 #endif
 				ps_stop_sound(data->terminals[data->dlterminalnum].prop, PSTYPE_GENERAL, 0xffff);
-				snd00010718(NULL, 0, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_01CC, 1, 1, -1, 1);
+				snd_start_extra(NULL, false, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_01CC, 1, 1, -1, true);
 			}
 
 			data->dlterminalnum = -1;
@@ -550,7 +550,7 @@ void htm_tick_chr(struct chrdata *chr)
 					hudmsg_create_with_flags(lang_get(L_MPWEAPONS_016), HUDMSGTYPE_MPSCENARIO, HUDMSGFLAG_ONLYIFALIVE);
 #endif
 					ps_stop_sound(data->terminals[data->dlterminalnum].prop, PSTYPE_GENERAL, 0xffff);
-					snd00010718(NULL, 0, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_01C1, 1, 1, -1, 1);
+					snd_start_extra(NULL, false, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_01C1, 1, 1, -1, true);
 				}
 
 				data->dlterminalnum = -1;
diff --git a/src/game/propsnd.c b/src/game/propsnd.c
index d64c9e6eb..1e199eabe 100644
--- a/src/game/propsnd.c
+++ b/src/game/propsnd.c
@@ -438,18 +438,18 @@ void ps_tick_channel(s32 channelnum)
 #if VERSION >= VERSION_NTSC_1_0
 					if (channel->flags & PSFLAG_AMBIENT) {
 						if (newvol) {
-							snd00010718(&channel->audiohandle, channel->flags & PSFLAG_ISMP3, newvol, newpan,
-									channel->requestedsoundnum, newpitch, channel->fxbus, newfx, 1);
+							snd_start_extra(&channel->audiohandle, channel->flags & PSFLAG_ISMP3, newvol, newpan,
+									channel->requestedsoundnum, newpitch, channel->fxbus, newfx, true);
 						}
 					} else {
 						if (newvol) {
-							snd00010718(&channel->audiohandle, channel->flags & PSFLAG_ISMP3, newvol, newpan,
-									channel->requestedsoundnum, newpitch, channel->fxbus, newfx, 1);
+							snd_start_extra(&channel->audiohandle, channel->flags & PSFLAG_ISMP3, newvol, newpan,
+									channel->requestedsoundnum, newpitch, channel->fxbus, newfx, true);
 						}
 					}
 #else
-					snd00010718(&channel->audiohandle, channel->flags & PSFLAG_ISMP3, newvol, newpan,
-							channel->requestedsoundnum, newpitch, channel->fxbus, newfx, 1);
+					snd_start_extra(&channel->audiohandle, channel->flags & PSFLAG_ISMP3, newvol, newpan,
+							channel->requestedsoundnum, newpitch, channel->fxbus, newfx, true);
 #endif
 				}
 
diff --git a/src/game/sight.c b/src/game/sight.c
index 7cfb6f69b..3c165e8fa 100644
--- a/src/game/sight.c
+++ b/src/game/sight.c
@@ -240,7 +240,7 @@ void sight_tick(bool sighton)
 				if (g_Vars.currentplayer->lookingatprop.prop != g_Vars.currentplayer->trackedprops[0].prop) {
 					struct sndstate *handle;
 
-					handle = snd00010718(&handle, 0, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_0007, 1, 1, -1, true);
+					handle = snd_start_extra(&handle, false, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_0007, 1, 1, -1, true);
 
 					trackedprop = &g_Vars.currentplayer->trackedprops[0];
 
@@ -266,7 +266,7 @@ void sight_tick(bool sighton)
 			if (index >= 0) {
 				struct sndstate *handle;
 
-				handle = snd00010718(&handle, 0, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_0007, 1, 1, -1, 1);
+				handle = snd_start_extra(&handle, false, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_0007, 1, 1, -1, true);
 
 				trackedprop = &g_Vars.currentplayer->trackedprops[index];
 
@@ -289,7 +289,7 @@ void sight_tick(bool sighton)
 			if (index >= 0) {
 				struct sndstate *handle;
 
-				handle = snd00010718(&handle, 0, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_0007, 1, 1, -1, 1);
+				handle = snd_start_extra(&handle, false, AL_VOL_FULL, AL_PAN_CENTER, SFXNUM_0007, 1, 1, -1, true);
 
 				trackedprop = &g_Vars.currentplayer->trackedprops[index];
 
diff --git a/src/include/lib/snd.h b/src/include/lib/snd.h
index 6626b876c..078fdf3a6 100644
--- a/src/include/lib/snd.h
+++ b/src/include/lib/snd.h
@@ -22,7 +22,7 @@ void snd_tick(void);
 bool snd_is_disabled(void);
 void snd_start_mp3_by_filenum(u32 filenum);
 void snd_adjust(struct sndstate **handle, bool ismp3, s32 vol, s32 pan, s32 soundnum, f32 pitch, s32 fxbus, s32 fxmix, bool forcefxmix);
-struct sndstate *snd00010718(struct sndstate **handle, bool ismp3, s32 volume, s32 pan, s32 soundnum, f32 pitch, s32 fxbus, s32 fxmix, bool forcefxmix);
+struct sndstate *snd_start_extra(struct sndstate **handle, bool ismp3, s32 volume, s32 pan, s32 soundnum, f32 pitch, s32 fxbus, s32 fxmix, bool forcefxmix);
 struct sndstate *snd_start(s32 arg0, s16 sound, struct sndstate **handle, s32 volume, s32 pan, f32 pitch, s32 fxbus, s32 fxmix);
 void snd_start_mp3(s16 soundnum, s32 volume, s32 pan, s32 responseflags);
 void snd_play_nosedive(s32 seconds);
diff --git a/src/lib/snd.c b/src/lib/snd.c
index 4b70521cd..59546f663 100644
--- a/src/lib/snd.c
+++ b/src/lib/snd.c
@@ -1605,7 +1605,7 @@ bool snd_stop_mp3(s16 soundnum)
 	return true;
 }
 
-void snd0000fc40(s32 arg0)
+void snd_stub_1arg(s32 arg0)
 {
 	// empty
 }
@@ -1724,7 +1724,7 @@ void snd_unpause_mp3(void)
 	}
 }
 
-void snd0000fe80(void)
+void snd_stub_0args(void)
 {
 	// empty
 }
@@ -1890,14 +1890,14 @@ void snd_tick(void)
 	}
 }
 
-s16 snd0001034c(s16 sfxnum)
+s16 snd_sfxref_to_sndnum(s16 sfxnum)
 {
-	union soundnumhack sfxref;
+	union soundnumhack tmp;
 
-	sfxref.packed = sfxnum;
-	sfxnum = sfxref.id;
+	tmp.packed = sfxnum;
+	sfxnum = tmp.id;
 
-	if (sfxref.id);
+	if (tmp.id);
 
 	return sfxnum;
 }
@@ -1963,11 +1963,7 @@ void snd_adjust(struct sndstate **handle, bool ismp3, s32 vol, s32 pan, s32 soun
 	struct audioconfig *config;
 
 	if (forcefxmix || fxmixarg != -1) {
-		if (fxmixarg != -1) {
-			fxmix = fxmixarg;
-		} else {
-			fxmix = 0;
-		}
+		fxmix = fxmixarg != -1 ? fxmixarg : 0;
 
 #if VERSION >= VERSION_NTSC_1_0
 		if (pan != -1 && g_SoundMode == SOUNDMODE_SURROUND && (pan & 0x80)) {
@@ -2037,7 +2033,23 @@ void snd_adjust(struct sndstate **handle, bool ismp3, s32 vol, s32 pan, s32 soun
 	}
 }
 
-struct sndstate *snd00010718(struct sndstate **handle, bool ismp3, s32 volume, s32 pan, s32 soundnum, f32 pitch, s32 fxbus, s32 fxmixarg, bool forcefxmix)
+/**
+ * Wrapper around snd_start, but using the same arguments as snd_adjust.
+ *
+ * Unlike snd_start, this function does the follow "extra" things:
+ * - Allows increasing the fxmix by 128 (likely to do with surround sound data)
+ * - Applies volpercentage from config
+ * - Applies pan from config
+ * - Applies language filter if flagged as offensive in config
+ *
+ * The function starts the sound by ensuring the current thread is higher
+ * priority than the audio thread. This doesn't matter so this is pointless.
+ *
+ * It is likely that snd_adjust was written first, then copied to create
+ * snd_start_extra, and because snd_adjust has to be threadsafe they made this
+ * one threadsafe as well.
+ */
+struct sndstate *snd_start_extra(struct sndstate **handle, bool ismp3, s32 volume, s32 pan, s32 soundnum, f32 pitch, s32 fxbus, s32 fxmixarg, bool forcefxmix)
 {
 	OSPri prevpri = osGetThreadPri(NULL);
 	s32 fxmix = -1;
@@ -2049,11 +2061,7 @@ struct sndstate *snd00010718(struct sndstate **handle, bool ismp3, s32 volume, s
 	osSetThreadPri(0, osGetThreadPri(&g_AudioManager.thread) + 1);
 
 	if (forcefxmix || fxmixarg != -1) {
-		if (fxmixarg != -1) {
-			fxmix = fxmixarg;
-		} else {
-			fxmix = 0;
-		}
+		fxmix = fxmixarg != -1 ? fxmixarg : 0;
 
 #if VERSION >= VERSION_NTSC_1_0
 		if (pan != -1 && g_SoundMode == SOUNDMODE_SURROUND && (pan & 0x80)) {