diff --git a/include/PR/n_libaudio.h b/include/PR/n_libaudio.h
index 758eb8a9a..4fdb02149 100644
--- a/include/PR/n_libaudio.h
+++ b/include/PR/n_libaudio.h
@@ -323,6 +323,7 @@ void    n_alSeqpSetTempo(N_ALSeqPlayer *seqp, s32 tempo);
 void    n_alSeqpSetVol(N_ALSeqPlayer *seqp, s16 vol);
 void    n_alSeqpStop(N_ALSeqPlayer *seqp);
 void    n_alSeqpLoop(N_ALSeqPlayer *seqp, ALSeqMarker *start, ALSeqMarker *end, s32 count);
+void    n_alSeqpSetFilter11(N_ALSeqPlayer *seqp);
 
 
 /*
diff --git a/ld/libfiles.ntsc-beta.inc b/ld/libfiles.ntsc-beta.inc
index 41e35bfc3..4eb6e6c49 100644
--- a/ld/libfiles.ntsc-beta.inc
+++ b/ld/libfiles.ntsc-beta.inc
@@ -80,7 +80,7 @@
 	build/ROMID/lib/naudio/n_csq.o (section); \
 	build/ROMID/lib/lib_39be0.o (section); \
 	build/ROMID/lib/lib_39c80.o (section); \
-	build/ROMID/lib/lib_39f70.o (section); \
+	build/ROMID/lib/naudio/n_seqpsetfilter11.o (section); \
 	build/ROMID/lib/naudio/n_syndelete.o (section); \
 	build/ROMID/lib/ultra/audio/cents2ratio.o (section); \
 	build/ROMID/lib/naudio/n_synallocfx.o (section); \
diff --git a/ld/libfiles.ntsc-final.inc b/ld/libfiles.ntsc-final.inc
index ca0c458dd..afe3b364c 100644
--- a/ld/libfiles.ntsc-final.inc
+++ b/ld/libfiles.ntsc-final.inc
@@ -77,7 +77,7 @@
 	build/ROMID/lib/naudio/n_csq.o (section); \
 	build/ROMID/lib/lib_39be0.o (section); \
 	build/ROMID/lib/lib_39c80.o (section); \
-	build/ROMID/lib/lib_39f70.o (section); \
+	build/ROMID/lib/naudio/n_seqpsetfilter11.o (section); \
 	build/ROMID/lib/naudio/n_syndelete.o (section); \
 	build/ROMID/lib/ultra/audio/cents2ratio.o (section); \
 	build/ROMID/lib/naudio/n_synallocfx.o (section); \
diff --git a/ld/libfiles.pal-final.inc b/ld/libfiles.pal-final.inc
index 9379d068f..f360fb492 100644
--- a/ld/libfiles.pal-final.inc
+++ b/ld/libfiles.pal-final.inc
@@ -77,7 +77,7 @@
 	build/ROMID/lib/naudio/n_csq.o (section); \
 	build/ROMID/lib/lib_39be0.o (section); \
 	build/ROMID/lib/lib_39c80.o (section); \
-	build/ROMID/lib/lib_39f70.o (section); \
+	build/ROMID/lib/naudio/n_seqpsetfilter11.o (section); \
 	build/ROMID/lib/naudio/n_syndelete.o (section); \
 	build/ROMID/lib/ultra/audio/cents2ratio.o (section); \
 	build/ROMID/lib/naudio/n_synallocfx.o (section); \
diff --git a/src/include/lib/lib_39f70.h b/src/include/lib/lib_39f70.h
deleted file mode 100644
index 0ea270e05..000000000
--- a/src/include/lib/lib_39f70.h
+++ /dev/null
@@ -1,9 +0,0 @@
-#ifndef _IN_LIB_LIB_39F70_H
-#define _IN_LIB_LIB_39F70_H
-#include <ultra64.h>
-#include "data.h"
-#include "types.h"
-
-u32 func00039f70(void);
-
-#endif
diff --git a/src/lib/lib_39f70.c b/src/lib/lib_39f70.c
deleted file mode 100644
index 10bb5d89b..000000000
--- a/src/lib/lib_39f70.c
+++ /dev/null
@@ -1,27 +0,0 @@
-#include <ultra64.h>
-#include "constants.h"
-#include "bss.h"
-#include "data.h"
-#include "types.h"
-
-GLOBAL_ASM(
-glabel func00039f70
-/*    39f70:	27bdffd8 */ 	addiu	$sp,$sp,-40
-/*    39f74:	afbf0014 */ 	sw	$ra,0x14($sp)
-/*    39f78:	afa40028 */ 	sw	$a0,0x28($sp)
-/*    39f7c:	240e0011 */ 	addiu	$t6,$zero,0x11
-/*    39f80:	a7ae0018 */ 	sh	$t6,0x18($sp)
-/*    39f84:	8fa40028 */ 	lw	$a0,0x28($sp)
-/*    39f88:	27a50018 */ 	addiu	$a1,$sp,0x18
-/*    39f8c:	00003025 */ 	or	$a2,$zero,$zero
-/*    39f90:	00003825 */ 	or	$a3,$zero,$zero
-/*    39f94:	0c00f184 */ 	jal	n_alEvtqPostEvent
-/*    39f98:	24840048 */ 	addiu	$a0,$a0,0x48
-/*    39f9c:	10000001 */ 	b	.L00039fa4
-/*    39fa0:	00000000 */ 	nop
-.L00039fa4:
-/*    39fa4:	8fbf0014 */ 	lw	$ra,0x14($sp)
-/*    39fa8:	27bd0028 */ 	addiu	$sp,$sp,0x28
-/*    39fac:	03e00008 */ 	jr	$ra
-/*    39fb0:	00000000 */ 	nop
-);
diff --git a/src/lib/music.c b/src/lib/music.c
index 02a1c232c..8faf0014d 100644
--- a/src/lib/music.c
+++ b/src/lib/music.c
@@ -1,4 +1,5 @@
 #include <ultra64.h>
+#include <n_libaudio.h>
 #include "constants.h"
 #include "game/music.h"
 #include "game/game_176080.h"
@@ -7,7 +8,6 @@
 #include "lib/music.h"
 #include "lib/lib_38d10.h"
 #include "lib/lib_39c80.h"
-#include "lib/lib_39f70.h"
 #include "data.h"
 #include "types.h"
 
@@ -231,7 +231,7 @@ glabel var70053fd8
 /*    1167c:	02340019 */ 	multu	$s1,$s4
 /*    11680:	00007812 */ 	mflo	$t7
 /*    11684:	026fc021 */ 	addu	$t8,$s3,$t7
-/*    11688:	0c00e7dc */ 	jal	func00039f70
+/*    11688:	0c00e7dc */ 	jal	n_alSeqpSetFilter11
 /*    1168c:	8f0400f8 */ 	lw	$a0,0xf8($t8)
 /*    11690:	3c08800b */ 	lui	$t0,%hi(var800aaa38)
 /*    11694:	2508aa38 */ 	addiu	$t0,$t0,%lo(var800aaa38)
@@ -284,7 +284,7 @@ glabel music00011700
 /*    11734:	3c048009 */ 	lui	$a0,%hi(var80094ed8+0xf8)
 /*    11738:	008f2021 */ 	addu	$a0,$a0,$t7
 /*    1173c:	8c844fd0 */ 	lw	$a0,%lo(var80094ed8+0xf8)($a0)
-/*    11740:	0c00e7dc */ 	jal	func00039f70
+/*    11740:	0c00e7dc */ 	jal	n_alSeqpSetFilter11
 /*    11744:	afa2001c */ 	sw	$v0,0x1c($sp)
 /*    11748:	8fa2001c */ 	lw	$v0,0x1c($sp)
 /*    1174c:	ac400000 */ 	sw	$zero,0x0($v0)
@@ -392,7 +392,7 @@ glabel music00011884
 /*    118ac:	26314ed8 */ 	addiu	$s1,$s1,%lo(var80094ed8)
 /*    118b0:	2610aa38 */ 	addiu	$s0,$s0,%lo(var800aaa38)
 .L000118b4:
-/*    118b4:	0c00e7dc */ 	jal	func00039f70
+/*    118b4:	0c00e7dc */ 	jal	n_alSeqpSetFilter11
 /*    118b8:	8e2400f8 */ 	lw	$a0,0xf8($s1)
 /*    118bc:	26100010 */ 	addiu	$s0,$s0,0x10
 /*    118c0:	26310108 */ 	addiu	$s1,$s1,0x108
@@ -476,7 +476,7 @@ glabel var70053fec
 /*    11998:	01c2082a */ 	slt	$at,$t6,$v0
 /*    1199c:	54200009 */ 	bnezl	$at,.L000119c4
 /*    119a0:	8e0f000c */ 	lw	$t7,0xc($s0)
-/*    119a4:	0c00e7dc */ 	jal	func00039f70
+/*    119a4:	0c00e7dc */ 	jal	n_alSeqpSetFilter11
 /*    119a8:	00000000 */ 	nop
 /*    119ac:	ae000000 */ 	sw	$zero,0x0($s0)
 /*    119b0:	ae000004 */ 	sw	$zero,0x4($s0)
@@ -487,7 +487,7 @@ glabel var70053fec
 .L000119c4:
 /*    119c4:	544f0008 */ 	bnel	$v0,$t7,.L000119e8
 /*    119c8:	26310001 */ 	addiu	$s1,$s1,0x1
-/*    119cc:	0c00e7dc */ 	jal	func00039f70
+/*    119cc:	0c00e7dc */ 	jal	n_alSeqpSetFilter11
 /*    119d0:	00000000 */ 	nop
 /*    119d4:	ae000000 */ 	sw	$zero,0x0($s0)
 /*    119d8:	ae000004 */ 	sw	$zero,0x4($s0)
@@ -801,7 +801,7 @@ glabel music0001190c
 /*    11d54:	0142082a */ 	slt	$at,$t2,$v0
 /*    11d58:	54200009 */ 	bnezl	$at,.NB00011d80
 /*    11d5c:	8e0b000c */ 	lw	$t3,0xc($s0)
-/*    11d60:	0c00ecd0 */ 	jal	func00039f70
+/*    11d60:	0c00ecd0 */ 	jal	n_alSeqpSetFilter11
 /*    11d64:	00000000 */ 	sll	$zero,$zero,0x0
 /*    11d68:	ae000000 */ 	sw	$zero,0x0($s0)
 /*    11d6c:	ae000004 */ 	sw	$zero,0x4($s0)
@@ -812,7 +812,7 @@ glabel music0001190c
 .NB00011d80:
 /*    11d80:	544b0008 */ 	bnel	$v0,$t3,.NB00011da4
 /*    11d84:	26310001 */ 	addiu	$s1,$s1,0x1
-/*    11d88:	0c00ecd0 */ 	jal	func00039f70
+/*    11d88:	0c00ecd0 */ 	jal	n_alSeqpSetFilter11
 /*    11d8c:	00000000 */ 	sll	$zero,$zero,0x0
 /*    11d90:	ae000000 */ 	sw	$zero,0x0($s0)
 /*    11d94:	ae000004 */ 	sw	$zero,0x4($s0)
diff --git a/src/lib/naudio/n_seqpsetfilter11.c b/src/lib/naudio/n_seqpsetfilter11.c
new file mode 100644
index 000000000..027cd038c
--- /dev/null
+++ b/src/lib/naudio/n_seqpsetfilter11.c
@@ -0,0 +1,11 @@
+#include <n_libaudio.h>
+#include "synthInternals.h"
+
+void n_alSeqpSetFilter11(N_ALSeqPlayer *seqp)
+{
+	N_ALEvent evt;
+
+	evt.type = AL_FILTER_11;
+
+	n_alEvtqPostEvent(&seqp->evtq, &evt, 0, 0);
+}