diff --git a/Makefile b/Makefile
index 27bc42b4e..b7c3c58dd 100644
--- a/Makefile
+++ b/Makefile
@@ -83,6 +83,7 @@ $(B_DIR)/lib/ultra/libc/llcvt.o: MIPSISET := -mips3 -32
 # it introduces a race condition when using make -j because they create a
 # temporary include-stdin.u file during compilation.
 # For these files, see their explicit targets towards the end of this file.
+$(B_DIR)/lib/ultra/audio/bnkf.o: OPT_LVL := -g
 $(B_DIR)/lib/ultra/audio/csplayer.o: OPT_LVL := -g
 $(B_DIR)/lib/ultra/audio/heap.o: OPT_LVL := -g
 $(B_DIR)/lib/ultra/gu/align.o: OPT_LVL := -O3
diff --git a/ld/libfiles.ntsc-beta.inc b/ld/libfiles.ntsc-beta.inc
index 35f8de976..bb64b1b05 100644
--- a/ld/libfiles.ntsc-beta.inc
+++ b/ld/libfiles.ntsc-beta.inc
@@ -68,6 +68,7 @@
 	build/ROMID/lib/lib_34030.o (section); \
 	build/ROMID/lib/ultra/audio/csplayer.o (section); \
 	build/ROMID/lib/lib_37650.o (section); \
+	build/ROMID/lib/ultra/audio/bnkf.o (section); \
 	build/ROMID/lib/lib_37b00.o (section); \
 	build/ROMID/lib/lib_38d10.o (section); \
 	build/ROMID/lib/lib_38d30.o (section); \
diff --git a/ld/libfiles.ntsc-final.inc b/ld/libfiles.ntsc-final.inc
index 4aff9392d..4a60289f5 100644
--- a/ld/libfiles.ntsc-final.inc
+++ b/ld/libfiles.ntsc-final.inc
@@ -66,6 +66,7 @@
 	build/ROMID/lib/lib_34030.o (section); \
 	build/ROMID/lib/ultra/audio/csplayer.o (section); \
 	build/ROMID/lib/lib_37650.o (section); \
+	build/ROMID/lib/ultra/audio/bnkf.o (section); \
 	build/ROMID/lib/lib_37b00.o (section); \
 	build/ROMID/lib/lib_38d10.o (section); \
 	build/ROMID/lib/lib_38d30.o (section); \
diff --git a/ld/libfiles.pal-final.inc b/ld/libfiles.pal-final.inc
index 8dbdc10d2..e68fbd4b4 100644
--- a/ld/libfiles.pal-final.inc
+++ b/ld/libfiles.pal-final.inc
@@ -66,6 +66,7 @@
 	build/ROMID/lib/lib_34030.o (section); \
 	build/ROMID/lib/ultra/audio/csplayer.o (section); \
 	build/ROMID/lib/lib_37650.o (section); \
+	build/ROMID/lib/ultra/audio/bnkf.o (section); \
 	build/ROMID/lib/lib_37b00.o (section); \
 	build/ROMID/lib/lib_38d10.o (section); \
 	build/ROMID/lib/lib_38d30.o (section); \
diff --git a/src/lib/lib_37650.c b/src/lib/lib_37650.c
index 1369d017d..dc1cffad7 100644
--- a/src/lib/lib_37650.c
+++ b/src/lib/lib_37650.c
@@ -29,327 +29,4 @@ glabel func00037650
 /*    37694:	27bd0028 */ 	addiu	$sp,$sp,0x28
 /*    37698:	03e00008 */ 	jr	$ra
 /*    3769c:	00000000 */ 	nop
-/*    376a0:	27bdfff8 */ 	addiu	$sp,$sp,-8
-/*    376a4:	afa50004 */ 	sw	$a1,0x4($sp)
-/*    376a8:	afa00000 */ 	sw	$zero,0x0($sp)
-/*    376ac:	848e0002 */ 	lh	$t6,0x2($a0)
-/*    376b0:	19c00010 */ 	blez	$t6,.L000376f4
-/*    376b4:	00000000 */ 	nop
-.L000376b8:
-/*    376b8:	8faf0000 */ 	lw	$t7,0x0($sp)
-/*    376bc:	8fa90004 */ 	lw	$t1,0x4($sp)
-/*    376c0:	000fc0c0 */ 	sll	$t8,$t7,0x3
-/*    376c4:	0098c821 */ 	addu	$t9,$a0,$t8
-/*    376c8:	8f280004 */ 	lw	$t0,0x4($t9)
-/*    376cc:	00985821 */ 	addu	$t3,$a0,$t8
-/*    376d0:	01095021 */ 	addu	$t2,$t0,$t1
-/*    376d4:	ad6a0004 */ 	sw	$t2,0x4($t3)
-/*    376d8:	8fac0000 */ 	lw	$t4,0x0($sp)
-/*    376dc:	258d0001 */ 	addiu	$t5,$t4,0x1
-/*    376e0:	afad0000 */ 	sw	$t5,0x0($sp)
-/*    376e4:	848e0002 */ 	lh	$t6,0x2($a0)
-/*    376e8:	01ae082a */ 	slt	$at,$t5,$t6
-/*    376ec:	1420fff2 */ 	bnez	$at,.L000376b8
-/*    376f0:	00000000 */ 	nop
-.L000376f4:
-/*    376f4:	10000001 */ 	b	.L000376fc
-/*    376f8:	00000000 */ 	nop
-.L000376fc:
-/*    376fc:	03e00008 */ 	jr	$ra
-/*    37700:	27bd0008 */ 	addiu	$sp,$sp,0x8
-);
-
-GLOBAL_ASM(
-glabel func00037704
-/*    37704:	27bdffd8 */ 	addiu	$sp,$sp,-40
-/*    37708:	afbf0014 */ 	sw	$ra,0x14($sp)
-/*    3770c:	afa40028 */ 	sw	$a0,0x28($sp)
-/*    37710:	afa5002c */ 	sw	$a1,0x2c($sp)
-/*    37714:	8fae0028 */ 	lw	$t6,0x28($sp)
-/*    37718:	afae0024 */ 	sw	$t6,0x24($sp)
-/*    3771c:	8faf002c */ 	lw	$t7,0x2c($sp)
-/*    37720:	afaf0020 */ 	sw	$t7,0x20($sp)
-/*    37724:	8fb80028 */ 	lw	$t8,0x28($sp)
-/*    37728:	24014231 */ 	addiu	$at,$zero,0x4231
-/*    3772c:	87190000 */ 	lh	$t9,0x0($t8)
-/*    37730:	13210003 */ 	beq	$t9,$at,.L00037740
-/*    37734:	00000000 */ 	nop
-/*    37738:	10000027 */ 	b	.L000377d8
-/*    3773c:	00000000 */ 	nop
-.L00037740:
-/*    37740:	8fa80028 */ 	lw	$t0,0x28($sp)
-/*    37744:	afa0001c */ 	sw	$zero,0x1c($sp)
-/*    37748:	85090002 */ 	lh	$t1,0x2($t0)
-/*    3774c:	19200020 */ 	blez	$t1,.L000377d0
-/*    37750:	00000000 */ 	nop
-.L00037754:
-/*    37754:	8fab001c */ 	lw	$t3,0x1c($sp)
-/*    37758:	8faa0028 */ 	lw	$t2,0x28($sp)
-/*    3775c:	8faf0024 */ 	lw	$t7,0x24($sp)
-/*    37760:	000b6080 */ 	sll	$t4,$t3,0x2
-/*    37764:	014c6821 */ 	addu	$t5,$t2,$t4
-/*    37768:	8dae0004 */ 	lw	$t6,0x4($t5)
-/*    3776c:	01cfc021 */ 	addu	$t8,$t6,$t7
-/*    37770:	adb80004 */ 	sw	$t8,0x4($t5)
-/*    37774:	8fa8001c */ 	lw	$t0,0x1c($sp)
-/*    37778:	8fb90028 */ 	lw	$t9,0x28($sp)
-/*    3777c:	00084880 */ 	sll	$t1,$t0,0x2
-/*    37780:	03295821 */ 	addu	$t3,$t9,$t1
-/*    37784:	8d6a0004 */ 	lw	$t2,0x4($t3)
-/*    37788:	11400009 */ 	beqz	$t2,.L000377b0
-/*    3778c:	00000000 */ 	nop
-/*    37790:	8fae001c */ 	lw	$t6,0x1c($sp)
-/*    37794:	8fac0028 */ 	lw	$t4,0x28($sp)
-/*    37798:	8fa50024 */ 	lw	$a1,0x24($sp)
-/*    3779c:	000e7880 */ 	sll	$t7,$t6,0x2
-/*    377a0:	018fc021 */ 	addu	$t8,$t4,$t7
-/*    377a4:	8f040004 */ 	lw	$a0,0x4($t8)
-/*    377a8:	0c00ddfa */ 	jal	func000377e8
-/*    377ac:	8fa60020 */ 	lw	$a2,0x20($sp)
-.L000377b0:
-/*    377b0:	8fad001c */ 	lw	$t5,0x1c($sp)
-/*    377b4:	8fb90028 */ 	lw	$t9,0x28($sp)
-/*    377b8:	25a80001 */ 	addiu	$t0,$t5,0x1
-/*    377bc:	afa8001c */ 	sw	$t0,0x1c($sp)
-/*    377c0:	87290002 */ 	lh	$t1,0x2($t9)
-/*    377c4:	0109082a */ 	slt	$at,$t0,$t1
-/*    377c8:	1420ffe2 */ 	bnez	$at,.L00037754
-/*    377cc:	00000000 */ 	nop
-.L000377d0:
-/*    377d0:	10000001 */ 	b	.L000377d8
-/*    377d4:	00000000 */ 	nop
-.L000377d8:
-/*    377d8:	8fbf0014 */ 	lw	$ra,0x14($sp)
-/*    377dc:	27bd0028 */ 	addiu	$sp,$sp,0x28
-/*    377e0:	03e00008 */ 	jr	$ra
-/*    377e4:	00000000 */ 	nop
-);
-
-GLOBAL_ASM(
-glabel func000377e8
-/*    377e8:	27bdffe0 */ 	addiu	$sp,$sp,-32
-/*    377ec:	afbf0014 */ 	sw	$ra,0x14($sp)
-/*    377f0:	afa40020 */ 	sw	$a0,0x20($sp)
-/*    377f4:	afa50024 */ 	sw	$a1,0x24($sp)
-/*    377f8:	afa60028 */ 	sw	$a2,0x28($sp)
-/*    377fc:	8fae0020 */ 	lw	$t6,0x20($sp)
-/*    37800:	91cf0002 */ 	lbu	$t7,0x2($t6)
-/*    37804:	11e00003 */ 	beqz	$t7,.L00037814
-/*    37808:	00000000 */ 	nop
-/*    3780c:	10000038 */ 	b	.L000378f0
-/*    37810:	00000000 */ 	nop
-.L00037814:
-/*    37814:	8fb90020 */ 	lw	$t9,0x20($sp)
-/*    37818:	24180001 */ 	addiu	$t8,$zero,0x1
-/*    3781c:	a3380002 */ 	sb	$t8,0x2($t9)
-/*    37820:	8fa80020 */ 	lw	$t0,0x20($sp)
-/*    37824:	8d090008 */ 	lw	$t1,0x8($t0)
-/*    37828:	1120000b */ 	beqz	$t1,.L00037858
-/*    3782c:	00000000 */ 	nop
-/*    37830:	8faa0020 */ 	lw	$t2,0x20($sp)
-/*    37834:	8fac0024 */ 	lw	$t4,0x24($sp)
-/*    37838:	8d4b0008 */ 	lw	$t3,0x8($t2)
-/*    3783c:	016c6821 */ 	addu	$t5,$t3,$t4
-/*    37840:	ad4d0008 */ 	sw	$t5,0x8($t2)
-/*    37844:	8fae0020 */ 	lw	$t6,0x20($sp)
-/*    37848:	8fa50024 */ 	lw	$a1,0x24($sp)
-/*    3784c:	8fa60028 */ 	lw	$a2,0x28($sp)
-/*    37850:	0c00de40 */ 	jal	func00037900
-/*    37854:	8dc40008 */ 	lw	$a0,0x8($t6)
-.L00037858:
-/*    37858:	8faf0020 */ 	lw	$t7,0x20($sp)
-/*    3785c:	afa0001c */ 	sw	$zero,0x1c($sp)
-/*    37860:	85f80000 */ 	lh	$t8,0x0($t7)
-/*    37864:	1b000020 */ 	blez	$t8,.L000378e8
-/*    37868:	00000000 */ 	nop
-.L0003786c:
-/*    3786c:	8fa8001c */ 	lw	$t0,0x1c($sp)
-/*    37870:	8fb90020 */ 	lw	$t9,0x20($sp)
-/*    37874:	8fad0024 */ 	lw	$t5,0x24($sp)
-/*    37878:	00084880 */ 	sll	$t1,$t0,0x2
-/*    3787c:	03295821 */ 	addu	$t3,$t9,$t1
-/*    37880:	8d6c000c */ 	lw	$t4,0xc($t3)
-/*    37884:	018d5021 */ 	addu	$t2,$t4,$t5
-/*    37888:	ad6a000c */ 	sw	$t2,0xc($t3)
-/*    3788c:	8faf001c */ 	lw	$t7,0x1c($sp)
-/*    37890:	8fae0020 */ 	lw	$t6,0x20($sp)
-/*    37894:	000fc080 */ 	sll	$t8,$t7,0x2
-/*    37898:	01d84021 */ 	addu	$t0,$t6,$t8
-/*    3789c:	8d19000c */ 	lw	$t9,0xc($t0)
-/*    378a0:	13200009 */ 	beqz	$t9,.L000378c8
-/*    378a4:	00000000 */ 	nop
-/*    378a8:	8fac001c */ 	lw	$t4,0x1c($sp)
-/*    378ac:	8fa90020 */ 	lw	$t1,0x20($sp)
-/*    378b0:	8fa50024 */ 	lw	$a1,0x24($sp)
-/*    378b4:	000c6880 */ 	sll	$t5,$t4,0x2
-/*    378b8:	012d5021 */ 	addu	$t2,$t1,$t5
-/*    378bc:	8d44000c */ 	lw	$a0,0xc($t2)
-/*    378c0:	0c00de40 */ 	jal	func00037900
-/*    378c4:	8fa60028 */ 	lw	$a2,0x28($sp)
-.L000378c8:
-/*    378c8:	8fab001c */ 	lw	$t3,0x1c($sp)
-/*    378cc:	8fae0020 */ 	lw	$t6,0x20($sp)
-/*    378d0:	256f0001 */ 	addiu	$t7,$t3,0x1
-/*    378d4:	afaf001c */ 	sw	$t7,0x1c($sp)
-/*    378d8:	85d80000 */ 	lh	$t8,0x0($t6)
-/*    378dc:	01f8082a */ 	slt	$at,$t7,$t8
-/*    378e0:	1420ffe2 */ 	bnez	$at,.L0003786c
-/*    378e4:	00000000 */ 	nop
-.L000378e8:
-/*    378e8:	10000001 */ 	b	.L000378f0
-/*    378ec:	00000000 */ 	nop
-.L000378f0:
-/*    378f0:	8fbf0014 */ 	lw	$ra,0x14($sp)
-/*    378f4:	27bd0020 */ 	addiu	$sp,$sp,0x20
-/*    378f8:	03e00008 */ 	jr	$ra
-/*    378fc:	00000000 */ 	nop
-);
-
-GLOBAL_ASM(
-glabel func00037900
-/*    37900:	27bdffe0 */ 	addiu	$sp,$sp,-32
-/*    37904:	afbf0014 */ 	sw	$ra,0x14($sp)
-/*    37908:	afa40020 */ 	sw	$a0,0x20($sp)
-/*    3790c:	afa50024 */ 	sw	$a1,0x24($sp)
-/*    37910:	afa60028 */ 	sw	$a2,0x28($sp)
-/*    37914:	8fae0020 */ 	lw	$t6,0x20($sp)
-/*    37918:	91cf0003 */ 	lbu	$t7,0x3($t6)
-/*    3791c:	11e00003 */ 	beqz	$t7,.L0003792c
-/*    37920:	00000000 */ 	nop
-/*    37924:	10000023 */ 	b	.L000379b4
-/*    37928:	00000000 */ 	nop
-.L0003792c:
-/*    3792c:	8fb90020 */ 	lw	$t9,0x20($sp)
-/*    37930:	24180001 */ 	addiu	$t8,$zero,0x1
-/*    37934:	a3380003 */ 	sb	$t8,0x3($t9)
-/*    37938:	8fa80020 */ 	lw	$t0,0x20($sp)
-/*    3793c:	afa0001c */ 	sw	$zero,0x1c($sp)
-/*    37940:	8509000e */ 	lh	$t1,0xe($t0)
-/*    37944:	19200019 */ 	blez	$t1,.L000379ac
-/*    37948:	00000000 */ 	nop
-.L0003794c:
-/*    3794c:	8fab001c */ 	lw	$t3,0x1c($sp)
-/*    37950:	8faa0020 */ 	lw	$t2,0x20($sp)
-/*    37954:	8faf0024 */ 	lw	$t7,0x24($sp)
-/*    37958:	000b6080 */ 	sll	$t4,$t3,0x2
-/*    3795c:	014c6821 */ 	addu	$t5,$t2,$t4
-/*    37960:	8dae0010 */ 	lw	$t6,0x10($t5)
-/*    37964:	01cfc021 */ 	addu	$t8,$t6,$t7
-/*    37968:	adb80010 */ 	sw	$t8,0x10($t5)
-/*    3796c:	8fa8001c */ 	lw	$t0,0x1c($sp)
-/*    37970:	8fb90020 */ 	lw	$t9,0x20($sp)
-/*    37974:	8fa50024 */ 	lw	$a1,0x24($sp)
-/*    37978:	00084880 */ 	sll	$t1,$t0,0x2
-/*    3797c:	03295821 */ 	addu	$t3,$t9,$t1
-/*    37980:	8d640010 */ 	lw	$a0,0x10($t3)
-/*    37984:	0c00de71 */ 	jal	func000379c4
-/*    37988:	8fa60028 */ 	lw	$a2,0x28($sp)
-/*    3798c:	8faa001c */ 	lw	$t2,0x1c($sp)
-/*    37990:	8fae0020 */ 	lw	$t6,0x20($sp)
-/*    37994:	254c0001 */ 	addiu	$t4,$t2,0x1
-/*    37998:	afac001c */ 	sw	$t4,0x1c($sp)
-/*    3799c:	85cf000e */ 	lh	$t7,0xe($t6)
-/*    379a0:	018f082a */ 	slt	$at,$t4,$t7
-/*    379a4:	1420ffe9 */ 	bnez	$at,.L0003794c
-/*    379a8:	00000000 */ 	nop
-.L000379ac:
-/*    379ac:	10000001 */ 	b	.L000379b4
-/*    379b0:	00000000 */ 	nop
-.L000379b4:
-/*    379b4:	8fbf0014 */ 	lw	$ra,0x14($sp)
-/*    379b8:	27bd0020 */ 	addiu	$sp,$sp,0x20
-/*    379bc:	03e00008 */ 	jr	$ra
-/*    379c0:	00000000 */ 	nop
-);
-
-GLOBAL_ASM(
-glabel func000379c4
-/*    379c4:	27bdffe8 */ 	addiu	$sp,$sp,-24
-/*    379c8:	afbf0014 */ 	sw	$ra,0x14($sp)
-/*    379cc:	afa40018 */ 	sw	$a0,0x18($sp)
-/*    379d0:	afa5001c */ 	sw	$a1,0x1c($sp)
-/*    379d4:	afa60020 */ 	sw	$a2,0x20($sp)
-/*    379d8:	8fae0018 */ 	lw	$t6,0x18($sp)
-/*    379dc:	91cf000e */ 	lbu	$t7,0xe($t6)
-/*    379e0:	11e00003 */ 	beqz	$t7,.L000379f0
-/*    379e4:	00000000 */ 	nop
-/*    379e8:	1000001a */ 	b	.L00037a54
-/*    379ec:	00000000 */ 	nop
-.L000379f0:
-/*    379f0:	8fb90018 */ 	lw	$t9,0x18($sp)
-/*    379f4:	24180001 */ 	addiu	$t8,$zero,0x1
-/*    379f8:	a338000e */ 	sb	$t8,0xe($t9)
-/*    379fc:	8fa80018 */ 	lw	$t0,0x18($sp)
-/*    37a00:	8faa001c */ 	lw	$t2,0x1c($sp)
-/*    37a04:	8d090000 */ 	lw	$t1,0x0($t0)
-/*    37a08:	012a5821 */ 	addu	$t3,$t1,$t2
-/*    37a0c:	ad0b0000 */ 	sw	$t3,0x0($t0)
-/*    37a10:	8fac0018 */ 	lw	$t4,0x18($sp)
-/*    37a14:	8fae001c */ 	lw	$t6,0x1c($sp)
-/*    37a18:	8d8d0004 */ 	lw	$t5,0x4($t4)
-/*    37a1c:	01ae7821 */ 	addu	$t7,$t5,$t6
-/*    37a20:	ad8f0004 */ 	sw	$t7,0x4($t4)
-/*    37a24:	8fb80018 */ 	lw	$t8,0x18($sp)
-/*    37a28:	8fa9001c */ 	lw	$t1,0x1c($sp)
-/*    37a2c:	8f190008 */ 	lw	$t9,0x8($t8)
-/*    37a30:	03295021 */ 	addu	$t2,$t9,$t1
-/*    37a34:	af0a0008 */ 	sw	$t2,0x8($t8)
-/*    37a38:	8fab0018 */ 	lw	$t3,0x18($sp)
-/*    37a3c:	8fa5001c */ 	lw	$a1,0x1c($sp)
-/*    37a40:	8fa60020 */ 	lw	$a2,0x20($sp)
-/*    37a44:	0c00de99 */ 	jal	func00037a64
-/*    37a48:	8d640008 */ 	lw	$a0,0x8($t3)
-/*    37a4c:	10000001 */ 	b	.L00037a54
-/*    37a50:	00000000 */ 	nop
-.L00037a54:
-/*    37a54:	8fbf0014 */ 	lw	$ra,0x14($sp)
-/*    37a58:	27bd0018 */ 	addiu	$sp,$sp,0x18
-/*    37a5c:	03e00008 */ 	jr	$ra
-/*    37a60:	00000000 */ 	nop
-);
-
-GLOBAL_ASM(
-glabel func00037a64
-/*    37a64:	908e0009 */ 	lbu	$t6,0x9($a0)
-/*    37a68:	11c00003 */ 	beqz	$t6,.L00037a78
-/*    37a6c:	00000000 */ 	nop
-/*    37a70:	03e00008 */ 	jr	$ra
-/*    37a74:	00000000 */ 	nop
-.L00037a78:
-/*    37a78:	240f0001 */ 	addiu	$t7,$zero,0x1
-/*    37a7c:	a08f0009 */ 	sb	$t7,0x9($a0)
-/*    37a80:	8c980000 */ 	lw	$t8,0x0($a0)
-/*    37a84:	0306c821 */ 	addu	$t9,$t8,$a2
-/*    37a88:	ac990000 */ 	sw	$t9,0x0($a0)
-/*    37a8c:	90880008 */ 	lbu	$t0,0x8($a0)
-/*    37a90:	1500000c */ 	bnez	$t0,.L00037ac4
-/*    37a94:	00000000 */ 	nop
-/*    37a98:	8c890010 */ 	lw	$t1,0x10($a0)
-/*    37a9c:	01255021 */ 	addu	$t2,$t1,$a1
-/*    37aa0:	ac8a0010 */ 	sw	$t2,0x10($a0)
-/*    37aa4:	8c8b000c */ 	lw	$t3,0xc($a0)
-/*    37aa8:	11600004 */ 	beqz	$t3,.L00037abc
-/*    37aac:	00000000 */ 	nop
-/*    37ab0:	8c8c000c */ 	lw	$t4,0xc($a0)
-/*    37ab4:	01856821 */ 	addu	$t5,$t4,$a1
-/*    37ab8:	ac8d000c */ 	sw	$t5,0xc($a0)
-.L00037abc:
-/*    37abc:	1000000b */ 	b	.L00037aec
-/*    37ac0:	00000000 */ 	nop
-.L00037ac4:
-/*    37ac4:	908e0008 */ 	lbu	$t6,0x8($a0)
-/*    37ac8:	24010001 */ 	addiu	$at,$zero,0x1
-/*    37acc:	15c10007 */ 	bne	$t6,$at,.L00037aec
-/*    37ad0:	00000000 */ 	nop
-/*    37ad4:	8c8f000c */ 	lw	$t7,0xc($a0)
-/*    37ad8:	11e00004 */ 	beqz	$t7,.L00037aec
-/*    37adc:	00000000 */ 	nop
-/*    37ae0:	8c98000c */ 	lw	$t8,0xc($a0)
-/*    37ae4:	0305c821 */ 	addu	$t9,$t8,$a1
-/*    37ae8:	ac99000c */ 	sw	$t9,0xc($a0)
-.L00037aec:
-/*    37aec:	03e00008 */ 	jr	$ra
-/*    37af0:	00000000 */ 	nop
-/*    37af4:	03e00008 */ 	jr	$ra
-/*    37af8:	00000000 */ 	nop
 );
diff --git a/src/lib/ultra/audio/bnkf.c b/src/lib/ultra/audio/bnkf.c
new file mode 100644
index 000000000..698761bf3
--- /dev/null
+++ b/src/lib/ultra/audio/bnkf.c
@@ -0,0 +1,315 @@
+#include <ultra64.h>
+#include "constants.h"
+#include "bss.h"
+#include "lib/lib_37650.h"
+#include "lib/lib_3c4d0.h"
+#include "data.h"
+#include "types.h"
+
+void alSeqFileNew(ALSeqFile *file, u8 *base)
+{
+	s32 offset = (s32) base;
+	s32 i;
+
+	/*
+	 * patch the file so that offsets are pointers
+	 */
+	for (i = 0; i < file->seqCount; i++) {
+		file->seqArray[i].offset = (u8 *)((u8 *)file->seqArray[i].offset + offset);
+	}
+}
+
+GLOBAL_ASM(
+glabel func00037704
+/*    37704:	27bdffd8 */ 	addiu	$sp,$sp,-40
+/*    37708:	afbf0014 */ 	sw	$ra,0x14($sp)
+/*    3770c:	afa40028 */ 	sw	$a0,0x28($sp)
+/*    37710:	afa5002c */ 	sw	$a1,0x2c($sp)
+/*    37714:	8fae0028 */ 	lw	$t6,0x28($sp)
+/*    37718:	afae0024 */ 	sw	$t6,0x24($sp)
+/*    3771c:	8faf002c */ 	lw	$t7,0x2c($sp)
+/*    37720:	afaf0020 */ 	sw	$t7,0x20($sp)
+/*    37724:	8fb80028 */ 	lw	$t8,0x28($sp)
+/*    37728:	24014231 */ 	addiu	$at,$zero,0x4231
+/*    3772c:	87190000 */ 	lh	$t9,0x0($t8)
+/*    37730:	13210003 */ 	beq	$t9,$at,.L00037740
+/*    37734:	00000000 */ 	nop
+/*    37738:	10000027 */ 	b	.L000377d8
+/*    3773c:	00000000 */ 	nop
+.L00037740:
+/*    37740:	8fa80028 */ 	lw	$t0,0x28($sp)
+/*    37744:	afa0001c */ 	sw	$zero,0x1c($sp)
+/*    37748:	85090002 */ 	lh	$t1,0x2($t0)
+/*    3774c:	19200020 */ 	blez	$t1,.L000377d0
+/*    37750:	00000000 */ 	nop
+.L00037754:
+/*    37754:	8fab001c */ 	lw	$t3,0x1c($sp)
+/*    37758:	8faa0028 */ 	lw	$t2,0x28($sp)
+/*    3775c:	8faf0024 */ 	lw	$t7,0x24($sp)
+/*    37760:	000b6080 */ 	sll	$t4,$t3,0x2
+/*    37764:	014c6821 */ 	addu	$t5,$t2,$t4
+/*    37768:	8dae0004 */ 	lw	$t6,0x4($t5)
+/*    3776c:	01cfc021 */ 	addu	$t8,$t6,$t7
+/*    37770:	adb80004 */ 	sw	$t8,0x4($t5)
+/*    37774:	8fa8001c */ 	lw	$t0,0x1c($sp)
+/*    37778:	8fb90028 */ 	lw	$t9,0x28($sp)
+/*    3777c:	00084880 */ 	sll	$t1,$t0,0x2
+/*    37780:	03295821 */ 	addu	$t3,$t9,$t1
+/*    37784:	8d6a0004 */ 	lw	$t2,0x4($t3)
+/*    37788:	11400009 */ 	beqz	$t2,.L000377b0
+/*    3778c:	00000000 */ 	nop
+/*    37790:	8fae001c */ 	lw	$t6,0x1c($sp)
+/*    37794:	8fac0028 */ 	lw	$t4,0x28($sp)
+/*    37798:	8fa50024 */ 	lw	$a1,0x24($sp)
+/*    3779c:	000e7880 */ 	sll	$t7,$t6,0x2
+/*    377a0:	018fc021 */ 	addu	$t8,$t4,$t7
+/*    377a4:	8f040004 */ 	lw	$a0,0x4($t8)
+/*    377a8:	0c00ddfa */ 	jal	func000377e8
+/*    377ac:	8fa60020 */ 	lw	$a2,0x20($sp)
+.L000377b0:
+/*    377b0:	8fad001c */ 	lw	$t5,0x1c($sp)
+/*    377b4:	8fb90028 */ 	lw	$t9,0x28($sp)
+/*    377b8:	25a80001 */ 	addiu	$t0,$t5,0x1
+/*    377bc:	afa8001c */ 	sw	$t0,0x1c($sp)
+/*    377c0:	87290002 */ 	lh	$t1,0x2($t9)
+/*    377c4:	0109082a */ 	slt	$at,$t0,$t1
+/*    377c8:	1420ffe2 */ 	bnez	$at,.L00037754
+/*    377cc:	00000000 */ 	nop
+.L000377d0:
+/*    377d0:	10000001 */ 	b	.L000377d8
+/*    377d4:	00000000 */ 	nop
+.L000377d8:
+/*    377d8:	8fbf0014 */ 	lw	$ra,0x14($sp)
+/*    377dc:	27bd0028 */ 	addiu	$sp,$sp,0x28
+/*    377e0:	03e00008 */ 	jr	$ra
+/*    377e4:	00000000 */ 	nop
+);
+
+GLOBAL_ASM(
+glabel func000377e8
+/*    377e8:	27bdffe0 */ 	addiu	$sp,$sp,-32
+/*    377ec:	afbf0014 */ 	sw	$ra,0x14($sp)
+/*    377f0:	afa40020 */ 	sw	$a0,0x20($sp)
+/*    377f4:	afa50024 */ 	sw	$a1,0x24($sp)
+/*    377f8:	afa60028 */ 	sw	$a2,0x28($sp)
+/*    377fc:	8fae0020 */ 	lw	$t6,0x20($sp)
+/*    37800:	91cf0002 */ 	lbu	$t7,0x2($t6)
+/*    37804:	11e00003 */ 	beqz	$t7,.L00037814
+/*    37808:	00000000 */ 	nop
+/*    3780c:	10000038 */ 	b	.L000378f0
+/*    37810:	00000000 */ 	nop
+.L00037814:
+/*    37814:	8fb90020 */ 	lw	$t9,0x20($sp)
+/*    37818:	24180001 */ 	addiu	$t8,$zero,0x1
+/*    3781c:	a3380002 */ 	sb	$t8,0x2($t9)
+/*    37820:	8fa80020 */ 	lw	$t0,0x20($sp)
+/*    37824:	8d090008 */ 	lw	$t1,0x8($t0)
+/*    37828:	1120000b */ 	beqz	$t1,.L00037858
+/*    3782c:	00000000 */ 	nop
+/*    37830:	8faa0020 */ 	lw	$t2,0x20($sp)
+/*    37834:	8fac0024 */ 	lw	$t4,0x24($sp)
+/*    37838:	8d4b0008 */ 	lw	$t3,0x8($t2)
+/*    3783c:	016c6821 */ 	addu	$t5,$t3,$t4
+/*    37840:	ad4d0008 */ 	sw	$t5,0x8($t2)
+/*    37844:	8fae0020 */ 	lw	$t6,0x20($sp)
+/*    37848:	8fa50024 */ 	lw	$a1,0x24($sp)
+/*    3784c:	8fa60028 */ 	lw	$a2,0x28($sp)
+/*    37850:	0c00de40 */ 	jal	func00037900
+/*    37854:	8dc40008 */ 	lw	$a0,0x8($t6)
+.L00037858:
+/*    37858:	8faf0020 */ 	lw	$t7,0x20($sp)
+/*    3785c:	afa0001c */ 	sw	$zero,0x1c($sp)
+/*    37860:	85f80000 */ 	lh	$t8,0x0($t7)
+/*    37864:	1b000020 */ 	blez	$t8,.L000378e8
+/*    37868:	00000000 */ 	nop
+.L0003786c:
+/*    3786c:	8fa8001c */ 	lw	$t0,0x1c($sp)
+/*    37870:	8fb90020 */ 	lw	$t9,0x20($sp)
+/*    37874:	8fad0024 */ 	lw	$t5,0x24($sp)
+/*    37878:	00084880 */ 	sll	$t1,$t0,0x2
+/*    3787c:	03295821 */ 	addu	$t3,$t9,$t1
+/*    37880:	8d6c000c */ 	lw	$t4,0xc($t3)
+/*    37884:	018d5021 */ 	addu	$t2,$t4,$t5
+/*    37888:	ad6a000c */ 	sw	$t2,0xc($t3)
+/*    3788c:	8faf001c */ 	lw	$t7,0x1c($sp)
+/*    37890:	8fae0020 */ 	lw	$t6,0x20($sp)
+/*    37894:	000fc080 */ 	sll	$t8,$t7,0x2
+/*    37898:	01d84021 */ 	addu	$t0,$t6,$t8
+/*    3789c:	8d19000c */ 	lw	$t9,0xc($t0)
+/*    378a0:	13200009 */ 	beqz	$t9,.L000378c8
+/*    378a4:	00000000 */ 	nop
+/*    378a8:	8fac001c */ 	lw	$t4,0x1c($sp)
+/*    378ac:	8fa90020 */ 	lw	$t1,0x20($sp)
+/*    378b0:	8fa50024 */ 	lw	$a1,0x24($sp)
+/*    378b4:	000c6880 */ 	sll	$t5,$t4,0x2
+/*    378b8:	012d5021 */ 	addu	$t2,$t1,$t5
+/*    378bc:	8d44000c */ 	lw	$a0,0xc($t2)
+/*    378c0:	0c00de40 */ 	jal	func00037900
+/*    378c4:	8fa60028 */ 	lw	$a2,0x28($sp)
+.L000378c8:
+/*    378c8:	8fab001c */ 	lw	$t3,0x1c($sp)
+/*    378cc:	8fae0020 */ 	lw	$t6,0x20($sp)
+/*    378d0:	256f0001 */ 	addiu	$t7,$t3,0x1
+/*    378d4:	afaf001c */ 	sw	$t7,0x1c($sp)
+/*    378d8:	85d80000 */ 	lh	$t8,0x0($t6)
+/*    378dc:	01f8082a */ 	slt	$at,$t7,$t8
+/*    378e0:	1420ffe2 */ 	bnez	$at,.L0003786c
+/*    378e4:	00000000 */ 	nop
+.L000378e8:
+/*    378e8:	10000001 */ 	b	.L000378f0
+/*    378ec:	00000000 */ 	nop
+.L000378f0:
+/*    378f0:	8fbf0014 */ 	lw	$ra,0x14($sp)
+/*    378f4:	27bd0020 */ 	addiu	$sp,$sp,0x20
+/*    378f8:	03e00008 */ 	jr	$ra
+/*    378fc:	00000000 */ 	nop
+);
+
+GLOBAL_ASM(
+glabel func00037900
+/*    37900:	27bdffe0 */ 	addiu	$sp,$sp,-32
+/*    37904:	afbf0014 */ 	sw	$ra,0x14($sp)
+/*    37908:	afa40020 */ 	sw	$a0,0x20($sp)
+/*    3790c:	afa50024 */ 	sw	$a1,0x24($sp)
+/*    37910:	afa60028 */ 	sw	$a2,0x28($sp)
+/*    37914:	8fae0020 */ 	lw	$t6,0x20($sp)
+/*    37918:	91cf0003 */ 	lbu	$t7,0x3($t6)
+/*    3791c:	11e00003 */ 	beqz	$t7,.L0003792c
+/*    37920:	00000000 */ 	nop
+/*    37924:	10000023 */ 	b	.L000379b4
+/*    37928:	00000000 */ 	nop
+.L0003792c:
+/*    3792c:	8fb90020 */ 	lw	$t9,0x20($sp)
+/*    37930:	24180001 */ 	addiu	$t8,$zero,0x1
+/*    37934:	a3380003 */ 	sb	$t8,0x3($t9)
+/*    37938:	8fa80020 */ 	lw	$t0,0x20($sp)
+/*    3793c:	afa0001c */ 	sw	$zero,0x1c($sp)
+/*    37940:	8509000e */ 	lh	$t1,0xe($t0)
+/*    37944:	19200019 */ 	blez	$t1,.L000379ac
+/*    37948:	00000000 */ 	nop
+.L0003794c:
+/*    3794c:	8fab001c */ 	lw	$t3,0x1c($sp)
+/*    37950:	8faa0020 */ 	lw	$t2,0x20($sp)
+/*    37954:	8faf0024 */ 	lw	$t7,0x24($sp)
+/*    37958:	000b6080 */ 	sll	$t4,$t3,0x2
+/*    3795c:	014c6821 */ 	addu	$t5,$t2,$t4
+/*    37960:	8dae0010 */ 	lw	$t6,0x10($t5)
+/*    37964:	01cfc021 */ 	addu	$t8,$t6,$t7
+/*    37968:	adb80010 */ 	sw	$t8,0x10($t5)
+/*    3796c:	8fa8001c */ 	lw	$t0,0x1c($sp)
+/*    37970:	8fb90020 */ 	lw	$t9,0x20($sp)
+/*    37974:	8fa50024 */ 	lw	$a1,0x24($sp)
+/*    37978:	00084880 */ 	sll	$t1,$t0,0x2
+/*    3797c:	03295821 */ 	addu	$t3,$t9,$t1
+/*    37980:	8d640010 */ 	lw	$a0,0x10($t3)
+/*    37984:	0c00de71 */ 	jal	func000379c4
+/*    37988:	8fa60028 */ 	lw	$a2,0x28($sp)
+/*    3798c:	8faa001c */ 	lw	$t2,0x1c($sp)
+/*    37990:	8fae0020 */ 	lw	$t6,0x20($sp)
+/*    37994:	254c0001 */ 	addiu	$t4,$t2,0x1
+/*    37998:	afac001c */ 	sw	$t4,0x1c($sp)
+/*    3799c:	85cf000e */ 	lh	$t7,0xe($t6)
+/*    379a0:	018f082a */ 	slt	$at,$t4,$t7
+/*    379a4:	1420ffe9 */ 	bnez	$at,.L0003794c
+/*    379a8:	00000000 */ 	nop
+.L000379ac:
+/*    379ac:	10000001 */ 	b	.L000379b4
+/*    379b0:	00000000 */ 	nop
+.L000379b4:
+/*    379b4:	8fbf0014 */ 	lw	$ra,0x14($sp)
+/*    379b8:	27bd0020 */ 	addiu	$sp,$sp,0x20
+/*    379bc:	03e00008 */ 	jr	$ra
+/*    379c0:	00000000 */ 	nop
+);
+
+GLOBAL_ASM(
+glabel func000379c4
+/*    379c4:	27bdffe8 */ 	addiu	$sp,$sp,-24
+/*    379c8:	afbf0014 */ 	sw	$ra,0x14($sp)
+/*    379cc:	afa40018 */ 	sw	$a0,0x18($sp)
+/*    379d0:	afa5001c */ 	sw	$a1,0x1c($sp)
+/*    379d4:	afa60020 */ 	sw	$a2,0x20($sp)
+/*    379d8:	8fae0018 */ 	lw	$t6,0x18($sp)
+/*    379dc:	91cf000e */ 	lbu	$t7,0xe($t6)
+/*    379e0:	11e00003 */ 	beqz	$t7,.L000379f0
+/*    379e4:	00000000 */ 	nop
+/*    379e8:	1000001a */ 	b	.L00037a54
+/*    379ec:	00000000 */ 	nop
+.L000379f0:
+/*    379f0:	8fb90018 */ 	lw	$t9,0x18($sp)
+/*    379f4:	24180001 */ 	addiu	$t8,$zero,0x1
+/*    379f8:	a338000e */ 	sb	$t8,0xe($t9)
+/*    379fc:	8fa80018 */ 	lw	$t0,0x18($sp)
+/*    37a00:	8faa001c */ 	lw	$t2,0x1c($sp)
+/*    37a04:	8d090000 */ 	lw	$t1,0x0($t0)
+/*    37a08:	012a5821 */ 	addu	$t3,$t1,$t2
+/*    37a0c:	ad0b0000 */ 	sw	$t3,0x0($t0)
+/*    37a10:	8fac0018 */ 	lw	$t4,0x18($sp)
+/*    37a14:	8fae001c */ 	lw	$t6,0x1c($sp)
+/*    37a18:	8d8d0004 */ 	lw	$t5,0x4($t4)
+/*    37a1c:	01ae7821 */ 	addu	$t7,$t5,$t6
+/*    37a20:	ad8f0004 */ 	sw	$t7,0x4($t4)
+/*    37a24:	8fb80018 */ 	lw	$t8,0x18($sp)
+/*    37a28:	8fa9001c */ 	lw	$t1,0x1c($sp)
+/*    37a2c:	8f190008 */ 	lw	$t9,0x8($t8)
+/*    37a30:	03295021 */ 	addu	$t2,$t9,$t1
+/*    37a34:	af0a0008 */ 	sw	$t2,0x8($t8)
+/*    37a38:	8fab0018 */ 	lw	$t3,0x18($sp)
+/*    37a3c:	8fa5001c */ 	lw	$a1,0x1c($sp)
+/*    37a40:	8fa60020 */ 	lw	$a2,0x20($sp)
+/*    37a44:	0c00de99 */ 	jal	func00037a64
+/*    37a48:	8d640008 */ 	lw	$a0,0x8($t3)
+/*    37a4c:	10000001 */ 	b	.L00037a54
+/*    37a50:	00000000 */ 	nop
+.L00037a54:
+/*    37a54:	8fbf0014 */ 	lw	$ra,0x14($sp)
+/*    37a58:	27bd0018 */ 	addiu	$sp,$sp,0x18
+/*    37a5c:	03e00008 */ 	jr	$ra
+/*    37a60:	00000000 */ 	nop
+);
+
+GLOBAL_ASM(
+glabel func00037a64
+/*    37a64:	908e0009 */ 	lbu	$t6,0x9($a0)
+/*    37a68:	11c00003 */ 	beqz	$t6,.L00037a78
+/*    37a6c:	00000000 */ 	nop
+/*    37a70:	03e00008 */ 	jr	$ra
+/*    37a74:	00000000 */ 	nop
+.L00037a78:
+/*    37a78:	240f0001 */ 	addiu	$t7,$zero,0x1
+/*    37a7c:	a08f0009 */ 	sb	$t7,0x9($a0)
+/*    37a80:	8c980000 */ 	lw	$t8,0x0($a0)
+/*    37a84:	0306c821 */ 	addu	$t9,$t8,$a2
+/*    37a88:	ac990000 */ 	sw	$t9,0x0($a0)
+/*    37a8c:	90880008 */ 	lbu	$t0,0x8($a0)
+/*    37a90:	1500000c */ 	bnez	$t0,.L00037ac4
+/*    37a94:	00000000 */ 	nop
+/*    37a98:	8c890010 */ 	lw	$t1,0x10($a0)
+/*    37a9c:	01255021 */ 	addu	$t2,$t1,$a1
+/*    37aa0:	ac8a0010 */ 	sw	$t2,0x10($a0)
+/*    37aa4:	8c8b000c */ 	lw	$t3,0xc($a0)
+/*    37aa8:	11600004 */ 	beqz	$t3,.L00037abc
+/*    37aac:	00000000 */ 	nop
+/*    37ab0:	8c8c000c */ 	lw	$t4,0xc($a0)
+/*    37ab4:	01856821 */ 	addu	$t5,$t4,$a1
+/*    37ab8:	ac8d000c */ 	sw	$t5,0xc($a0)
+.L00037abc:
+/*    37abc:	1000000b */ 	b	.L00037aec
+/*    37ac0:	00000000 */ 	nop
+.L00037ac4:
+/*    37ac4:	908e0008 */ 	lbu	$t6,0x8($a0)
+/*    37ac8:	24010001 */ 	addiu	$at,$zero,0x1
+/*    37acc:	15c10007 */ 	bne	$t6,$at,.L00037aec
+/*    37ad0:	00000000 */ 	nop
+/*    37ad4:	8c8f000c */ 	lw	$t7,0xc($a0)
+/*    37ad8:	11e00004 */ 	beqz	$t7,.L00037aec
+/*    37adc:	00000000 */ 	nop
+/*    37ae0:	8c98000c */ 	lw	$t8,0xc($a0)
+/*    37ae4:	0305c821 */ 	addu	$t9,$t8,$a1
+/*    37ae8:	ac99000c */ 	sw	$t9,0xc($a0)
+.L00037aec:
+/*    37aec:	03e00008 */ 	jr	$ra
+/*    37af0:	00000000 */ 	nop
+/*    37af4:	03e00008 */ 	jr	$ra
+/*    37af8:	00000000 */ 	nop
+);