diff --git a/ld/libfiles.ntsc-beta.inc b/ld/libfiles.ntsc-beta.inc
index 51aa03fd4..983b36c68 100644
--- a/ld/libfiles.ntsc-beta.inc
+++ b/ld/libfiles.ntsc-beta.inc
@@ -93,6 +93,7 @@
 	build/ROMID/lib/naudio/n_synsetvol.o (section); \
 	build/ROMID/lib/lib_3cdc0.o (section); \
 	build/ROMID/lib/lib_3cef0.o (section); \
+	build/ROMID/lib/naudio/n_synsetfxmix.o (section); \
 	build/ROMID/lib/naudio/n_synstopvoice.o (section); \
 	build/ROMID/lib/naudio/n_synfreevoice.o (section); \
 	build/ROMID/lib/naudio/n_seqplayer.o (section); \
diff --git a/ld/libfiles.ntsc-final.inc b/ld/libfiles.ntsc-final.inc
index b59ea9583..0566d8e07 100644
--- a/ld/libfiles.ntsc-final.inc
+++ b/ld/libfiles.ntsc-final.inc
@@ -90,6 +90,7 @@
 	build/ROMID/lib/naudio/n_synsetvol.o (section); \
 	build/ROMID/lib/lib_3cdc0.o (section); \
 	build/ROMID/lib/lib_3cef0.o (section); \
+	build/ROMID/lib/naudio/n_synsetfxmix.o (section); \
 	build/ROMID/lib/naudio/n_synstopvoice.o (section); \
 	build/ROMID/lib/naudio/n_synfreevoice.o (section); \
 	build/ROMID/lib/naudio/n_seqplayer.o (section); \
diff --git a/ld/libfiles.pal-final.inc b/ld/libfiles.pal-final.inc
index 14947b77b..327fcb393 100644
--- a/ld/libfiles.pal-final.inc
+++ b/ld/libfiles.pal-final.inc
@@ -90,6 +90,7 @@
 	build/ROMID/lib/naudio/n_synsetvol.o (section); \
 	build/ROMID/lib/lib_3cdc0.o (section); \
 	build/ROMID/lib/lib_3cef0.o (section); \
+	build/ROMID/lib/naudio/n_synsetfxmix.o (section); \
 	build/ROMID/lib/naudio/n_synstopvoice.o (section); \
 	build/ROMID/lib/naudio/n_synfreevoice.o (section); \
 	build/ROMID/lib/naudio/n_seqplayer.o (section); \
diff --git a/src/include/lib/lib_3cef0.h b/src/include/lib/lib_3cef0.h
index 75cc2ed1c..7d1b85d71 100644
--- a/src/include/lib/lib_3cef0.h
+++ b/src/include/lib/lib_3cef0.h
@@ -5,6 +5,5 @@
 #include "types.h"
 
 u32 func0003cef0(void);
-void func0003d050(N_ALVoice *v, u8 arg1);
 
 #endif
diff --git a/src/lib/lib_317f0.c b/src/lib/lib_317f0.c
index 78df97e8e..32358ac26 100644
--- a/src/lib/lib_317f0.c
+++ b/src/lib/lib_317f0.c
@@ -1575,7 +1575,7 @@ glabel var7005477c
 /*    328e4:	afa8007c */ 	sw	$t0,0x7c($sp)
 /*    328e8:	8fa40060 */ 	lw	$a0,0x60($sp)
 /*    328ec:	8fa5007c */ 	lw	$a1,0x7c($sp)
-/*    328f0:	0c00f414 */ 	jal	func0003d050
+/*    328f0:	0c00f414 */ 	jal	n_alSynSetFXMix
 /*    328f4:	2484000c */ 	addiu	$a0,$a0,0xc
 .L000328f8:
 /*    328f8:	100001c7 */ 	b	.L00033018
@@ -1638,7 +1638,7 @@ glabel var7005477c
 /*    329c0:	afaf007c */ 	sw	$t7,0x7c($sp)
 /*    329c4:	8fa40060 */ 	lw	$a0,0x60($sp)
 /*    329c8:	8fa5007c */ 	lw	$a1,0x7c($sp)
-/*    329cc:	0c00f414 */ 	jal	func0003d050
+/*    329cc:	0c00f414 */ 	jal	n_alSynSetFXMix
 /*    329d0:	2484000c */ 	addiu	$a0,$a0,0xc
 .L000329d4:
 /*    329d4:	10000190 */ 	b	.L00033018
@@ -2991,7 +2991,7 @@ glabel var7005477c
 /*    33ec4:	afa8007c */ 	sw	$t0,0x7c($sp)
 /*    33ec8:	8fa40060 */ 	lw	$a0,0x60($sp)
 /*    33ecc:	8fa5007c */ 	lw	$a1,0x7c($sp)
-/*    33ed0:	0c00f908 */ 	jal	func0003d050
+/*    33ed0:	0c00f908 */ 	jal	n_alSynSetFXMix
 /*    33ed4:	2484000c */ 	addiu	$a0,$a0,0xc
 .NB00033ed8:
 /*    33ed8:	100001b3 */ 	beqz	$zero,.NB000345a8
@@ -3054,7 +3054,7 @@ glabel var7005477c
 /*    33fa0:	afad007c */ 	sw	$t5,0x7c($sp)
 /*    33fa4:	8fa40060 */ 	lw	$a0,0x60($sp)
 /*    33fa8:	8fa5007c */ 	lw	$a1,0x7c($sp)
-/*    33fac:	0c00f908 */ 	jal	func0003d050
+/*    33fac:	0c00f908 */ 	jal	n_alSynSetFXMix
 /*    33fb0:	2484000c */ 	addiu	$a0,$a0,0xc
 .NB00033fb4:
 /*    33fb4:	1000017c */ 	beqz	$zero,.NB000345a8
diff --git a/src/lib/lib_3cef0.c b/src/lib/lib_3cef0.c
index 6861bddb1..e65d78507 100644
--- a/src/lib/lib_3cef0.c
+++ b/src/lib/lib_3cef0.c
@@ -106,54 +106,3 @@ glabel n_alSynSetPitch
 /*    3d048:	03e00008 */ 	jr	$ra
 /*    3d04c:	00000000 */ 	nop
 );
-
-GLOBAL_ASM(
-glabel func0003d050
-/*    3d050:	27bdffe0 */ 	addiu	$sp,$sp,-32
-/*    3d054:	afbf0014 */ 	sw	$ra,0x14($sp)
-/*    3d058:	afa40020 */ 	sw	$a0,0x20($sp)
-/*    3d05c:	afa50024 */ 	sw	$a1,0x24($sp)
-/*    3d060:	8fae0020 */ 	lw	$t6,0x20($sp)
-/*    3d064:	8dcf0008 */ 	lw	$t7,0x8($t6)
-/*    3d068:	11e0001f */ 	beqz	$t7,.L0003d0e8
-/*    3d06c:	00000000 */ 	nop
-/*    3d070:	0c00c541 */ 	jal	__n_allocParam
-/*    3d074:	00000000 */ 	nop
-/*    3d078:	afa2001c */ 	sw	$v0,0x1c($sp)
-/*    3d07c:	8fb8001c */ 	lw	$t8,0x1c($sp)
-/*    3d080:	17000003 */ 	bnez	$t8,.L0003d090
-/*    3d084:	00000000 */ 	nop
-/*    3d088:	10000019 */ 	b	.L0003d0f0
-/*    3d08c:	00000000 */ 	nop
-.L0003d090:
-/*    3d090:	8fa90020 */ 	lw	$t1,0x20($sp)
-/*    3d094:	3c198006 */ 	lui	$t9,%hi(n_syn)
-/*    3d098:	8f39f114 */ 	lw	$t9,%lo(n_syn)($t9)
-/*    3d09c:	8d2a0008 */ 	lw	$t2,0x8($t1)
-/*    3d0a0:	8fad001c */ 	lw	$t5,0x1c($sp)
-/*    3d0a4:	8f28001c */ 	lw	$t0,0x1c($t9)
-/*    3d0a8:	8d4b0088 */ 	lw	$t3,0x88($t2)
-/*    3d0ac:	010b6021 */ 	addu	$t4,$t0,$t3
-/*    3d0b0:	adac0004 */ 	sw	$t4,0x4($t5)
-/*    3d0b4:	8faf001c */ 	lw	$t7,0x1c($sp)
-/*    3d0b8:	240e0010 */ 	addiu	$t6,$zero,0x10
-/*    3d0bc:	a5ee0008 */ 	sh	$t6,0x8($t7)
-/*    3d0c0:	93b80027 */ 	lbu	$t8,0x27($sp)
-/*    3d0c4:	8fb9001c */ 	lw	$t9,0x1c($sp)
-/*    3d0c8:	af38000c */ 	sw	$t8,0xc($t9)
-/*    3d0cc:	8fa9001c */ 	lw	$t1,0x1c($sp)
-/*    3d0d0:	ad200000 */ 	sw	$zero,0x0($t1)
-/*    3d0d4:	8faa0020 */ 	lw	$t2,0x20($sp)
-/*    3d0d8:	24050003 */ 	addiu	$a1,$zero,0x3
-/*    3d0dc:	8fa6001c */ 	lw	$a2,0x1c($sp)
-/*    3d0e0:	0c00fc79 */ 	jal	n_alEnvmixerParam
-/*    3d0e4:	8d440008 */ 	lw	$a0,0x8($t2)
-.L0003d0e8:
-/*    3d0e8:	10000001 */ 	b	.L0003d0f0
-/*    3d0ec:	00000000 */ 	nop
-.L0003d0f0:
-/*    3d0f0:	8fbf0014 */ 	lw	$ra,0x14($sp)
-/*    3d0f4:	27bd0020 */ 	addiu	$sp,$sp,0x20
-/*    3d0f8:	03e00008 */ 	jr	$ra
-/*    3d0fc:	00000000 */ 	nop
-);
diff --git a/src/lib/naudio/n_csplayer.c b/src/lib/naudio/n_csplayer.c
index 23eca2877..cdd3c30ff 100644
--- a/src/lib/naudio/n_csplayer.c
+++ b/src/lib/naudio/n_csplayer.c
@@ -326,7 +326,6 @@ void __n_CSPHandleNextSeqEvent(N_ALCSPlayer *seqp);
 
 void func0003e3e0(N_ALVoice *v, f32 arg1);
 u8 func0003d9cc(N_ALVoiceState *vs, N_ALCSPlayer *seqp);
-void func0003d050(N_ALVoice *v, u8 arg1);
 ALFxRef func0003e540(u8 arg0);
 ALFxRef func0003e5b8(u8 arg0);
 void func0003e674(ALFxRef fx, u8 arg1, void *param);
@@ -441,7 +440,7 @@ ALMicroTime __n_CSPVoiceHandler(void *node)
 			seqp->unk80 = seqp->nextEvent.msg.evt18.unk04;
 
 			for (vs = seqp->vAllocHead; vs != 0; vs = vs->next) {
-				func0003d050(&vs->voice, func0003d9cc(vs, seqp));
+				n_alSynSetFXMix(&vs->voice, func0003d9cc(vs, seqp));
 			}
 			break;
 
@@ -2510,7 +2509,7 @@ glabel var70054a74
 /*    366b8:	000e7080 */ 	sll	$t6,$t6,0x2
 /*    366bc:	030e7821 */ 	addu	$t7,$t8,$t6
 /*    366c0:	91e5000a */ 	lbu	$a1,0xa($t7)
-/*    366c4:	0c00f414 */ 	jal	func0003d050
+/*    366c4:	0c00f414 */ 	jal	n_alSynSetFXMix
 /*    366c8:	24840004 */ 	addiu	$a0,$a0,0x4
 .L000366cc:
 /*    366cc:	8fa800c8 */ 	lw	$t0,0xc8($sp)
@@ -5028,7 +5027,7 @@ glabel var70054a74
 /*    366b8:	000e7080 */ 	sll	$t6,$t6,0x2
 /*    366bc:	030e7821 */ 	addu	$t7,$t8,$t6
 /*    366c0:	91e5000a */ 	lbu	$a1,0xa($t7)
-/*    366c4:	0c00f414 */ 	jal	func0003d050
+/*    366c4:	0c00f414 */ 	jal	n_alSynSetFXMix
 /*    366c8:	24840004 */ 	addiu	$a0,$a0,0x4
 .L000366cc:
 /*    366cc:	8fa800c8 */ 	lw	$t0,0xc8($sp)
diff --git a/src/lib/naudio/n_synsetfxmix.c b/src/lib/naudio/n_synsetfxmix.c
new file mode 100644
index 000000000..69821c504
--- /dev/null
+++ b/src/lib/naudio/n_synsetfxmix.c
@@ -0,0 +1,26 @@
+#include <os_internal.h>
+#include <ultraerror.h>
+#include "n_synthInternals.h"
+
+void n_alSynSetFXMix(N_ALVoice *v, u8 fxmix)
+{
+	ALParam *update;
+
+	if (v->pvoice) {
+		/*
+		 * get new update struct from the free list
+		 */
+		update = __n_allocParam();
+		ALFailIf(update == 0, ERR_ALSYN_NO_UPDATE);
+
+		/*
+		 * set offset and fxmix data
+		 */
+		update->delta = n_syn->paramSamples + v->pvoice->offset;
+		update->type = AL_FILTER_SET_FXAMT;
+		update->data.i = fxmix;
+		update->next  = 0;
+
+		n_alEnvmixerParam(v->pvoice, AL_FILTER_ADD_UPDATE, update);
+	}
+}