diff --git a/linker_scripts/us/symbol_addrs_code.txt b/linker_scripts/us/symbol_addrs_code.txt
index c02b74b..901a32a 100644
--- a/linker_scripts/us/symbol_addrs_code.txt
+++ b/linker_scripts/us/symbol_addrs_code.txt
@@ -1448,11 +1448,11 @@ func_8004DF94 = 0x8004DF94; // type:func
 func_8004E304 = 0x8004E304; // type:func
 func_8004E810 = 0x8004E810; // type:func
 func_8004EBC8 = 0x8004EBC8; // type:func
-func_8004EBF0 = 0x8004EBF0; // type:func
+n_alSynSetPitch = 0x8004EBF0; // type:func
 n_alFxNew = 0x8004EC70; // type:func
 alN_PVoiceNew = 0x8004F084; // type:func
 n_alAuxBusPull = 0x8004F1B0; // type:func
-func_8004F260 = 0x8004F260; // type:func
+n_alSynSetFXMix = 0x8004F260; // type:func
 func_8004F2F0 = 0x8004F2F0; // type:func
 func_8004F350 = 0x8004F350; // type:func
 func_8004F4F8 = 0x8004F4F8; // type:func
diff --git a/src/4F7F0.c b/src/4F7F0.c
deleted file mode 100644
index bf81bb2..0000000
--- a/src/4F7F0.c
+++ /dev/null
@@ -1,37 +0,0 @@
-#include "global.h"
-#include "n_synthInternals.h"
-
-struct UnkArray4 {
-    u32 unk0;
-    u32 unk4;
-    u16 unk8;
-    u16 unkA;
-    f32 unkC;
-    u32 unk10;
-    u32 unk14;
-    u32 unk18;
-    u32 unk1C;
-};
-struct UnkStructUnk8 {
-    char filler[0x88];
-    u32 unk88;
-};
-struct UnkStruct8004EBF0 {
-    char filler[0x8];
-    struct UnkStructUnk8* unk8;
-};
-
-void func_8004EBF0(struct UnkStruct8004EBF0* arg0, f32 arg1) {
-    struct UnkArray4* temp_v0;
-
-    if (arg0->unk8 != NULL) {
-        temp_v0 = (struct UnkArray4*)__n_allocParam(); // TODO: Fix this
-        if (temp_v0 != NULL) {
-            temp_v0->unk4 = (s32)(n_syn->paramSamples + arg0->unk8->unk88);
-            temp_v0->unk8 = 7;
-            temp_v0->unkC = arg1;
-            temp_v0->unk0 = 0;
-            n_alEnvmixerParam(arg0->unk8, 3, temp_v0);
-        }
-    }
-}
diff --git a/src/4FE60.c b/src/4FE60.c
deleted file mode 100644
index a34dfa5..0000000
--- a/src/4FE60.c
+++ /dev/null
@@ -1,5 +0,0 @@
-#include "global.h"
-
-#pragma GLOBAL_ASM("asm/us/nonmatchings/4FE60/func_8004F260.s")
-
-#pragma GLOBAL_ASM("asm/us/nonmatchings/4FE60/func_8004F2F0.s")
diff --git a/src/4FEF0.c b/src/4FEF0.c
new file mode 100644
index 0000000..05e8aa8
--- /dev/null
+++ b/src/4FEF0.c
@@ -0,0 +1,4 @@
+#include "global.h"
+
+
+#pragma GLOBAL_ASM("asm/us/nonmatchings/4FEF0/func_8004F2F0.s")
diff --git a/src/libnaudio/n_synsetfxmix.c b/src/libnaudio/n_synsetfxmix.c
new file mode 100644
index 0000000..b397e0e
--- /dev/null
+++ b/src/libnaudio/n_synsetfxmix.c
@@ -0,0 +1,52 @@
+/*====================================================================
+ *
+ * Copyright 1993, Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics,
+ * Inc.; the contents of this file may not be disclosed to third
+ * parties, copied or duplicated in any form, in whole or in part,
+ * without the prior written permission of Silicon Graphics, Inc.
+ *
+ * RESTRICTED RIGHTS LEGEND:
+ * Use, duplication or disclosure by the Government is subject to
+ * restrictions as set forth in subdivision (c)(1)(ii) of the Rights
+ * in Technical Data and Computer Software clause at DFARS
+ * 252.227-7013, and/or in similar or successor clauses in the FAR,
+ * DOD or NASA FAR Supplement. Unpublished - rights reserved under the
+ * Copyright Laws of the United States.
+ *====================================================================*/
+
+#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
+         */
+#ifdef SAMPLE_ROUND
+	update->delta  = SAMPLE184( n_syn->paramSamples + v->pvoice->offset);
+#else
+        update->delta  = n_syn->paramSamples + v->pvoice->offset;
+#endif
+        update->type   = AL_FILTER_SET_FXAMT;
+	if (fxmix > 127)
+	    fxmix = 127;
+	update->data.i = fxmix;
+        update->next   = 0;
+
+	n_alEnvmixerParam(v->pvoice, AL_FILTER_ADD_UPDATE, update);
+    }
+}
+
diff --git a/src/libnaudio/n_synsetpitch.c b/src/libnaudio/n_synsetpitch.c
new file mode 100644
index 0000000..76b000f
--- /dev/null
+++ b/src/libnaudio/n_synsetpitch.c
@@ -0,0 +1,51 @@
+/*====================================================================
+ *
+ * Copyright 1993, Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics,
+ * Inc.; the contents of this file may not be disclosed to third
+ * parties, copied or duplicated in any form, in whole or in part,
+ * without the prior written permission of Silicon Graphics, Inc.
+ *
+ * RESTRICTED RIGHTS LEGEND:
+ * Use, duplication or disclosure by the Government is subject to
+ * restrictions as set forth in subdivision (c)(1)(ii) of the Rights
+ * in Technical Data and Computer Software clause at DFARS
+ * 252.227-7013, and/or in similar or successor clauses in the FAR,
+ * DOD or NASA FAR Supplement. Unpublished - rights reserved under the
+ * Copyright Laws of the United States.
+ *====================================================================*/
+
+#include <os_internal.h>
+#include <ultraerror.h>
+#include "n_synthInternals.h"
+
+void n_alSynSetPitch(N_ALVoice *v, f32 pitch)
+{
+    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 pitch data
+         */
+#ifdef SAMPLE_ROUND
+	update->delta  = SAMPLE184( n_syn->paramSamples + v->pvoice->offset);
+#else
+        update->delta  = n_syn->paramSamples + v->pvoice->offset;
+#endif
+        update->type   = AL_FILTER_SET_PITCH;
+        update->data.f = pitch;
+        update->next   = 0;
+
+	n_alEnvmixerParam(v->pvoice, AL_FILTER_ADD_UPDATE, update);        
+    }
+}
+
diff --git a/yamls/us/rom.yaml b/yamls/us/rom.yaml
index 245b1c0..62591d5 100644
--- a/yamls/us/rom.yaml
+++ b/yamls/us/rom.yaml
@@ -103,10 +103,11 @@
     - [0x4BDC0, c, 4BDC0]
     - [0x4CBC0, c, 4CBC0]
     - [0x4F410, c]
-    - [0x4F7F0, c]
+    - [0x4F7F0, c, libnaudio/n_synsetpitch]
     - [0x4F870, c, libnaudio/n_drvrNew]
     - [0x4FDB0, c, libnaudio/n_auxbus]
-    - [0x4FE60, c]
+    - [0x4FE60, c, libnaudio/n_synsetfxmix]
+    - [0x4FEF0, c]
     - [0x4FF50, c]
     - [0x50120, c]
     - [0x50860, c]