diff --git a/Makefile b/Makefile
index 90cf3be2..53a0ef65 100644
--- a/Makefile
+++ b/Makefile
@@ -130,6 +130,8 @@ $(BUILD_DIR)/src/musyx/snd_init.o: CFLAGS := $(CFLAGS_MUSYX)
 $(BUILD_DIR)/src/musyx/dsp_import.o: CFLAGS := $(CFLAGS_MUSYX)
 $(BUILD_DIR)/src/musyx/hw_memory.o: CFLAGS := $(CFLAGS_MUSYX)
 $(BUILD_DIR)/src/musyx/reverb_fx.o: CFLAGS := $(CFLAGS_MUSYX)
+$(BUILD_DIR)/src/musyx/delay_fx.o: CFLAGS := $(CFLAGS_MUSYX)
+
 
 #-------------------------------------------------------------------------------
 # Recipes
diff --git a/include/musyx/musyx.h b/include/musyx/musyx.h
index f1070ec4..0f64e5cb 100644
--- a/include/musyx/musyx.h
+++ b/include/musyx/musyx.h
@@ -4,7 +4,7 @@
 #include "types.h"
 
 #ifndef bool8
-typedef char bool8;
+typedef unsigned char bool8;
 #endif
 
 #ifdef __cplusplus
@@ -26,6 +26,9 @@ typedef struct _SND_HOOKS {
 
 #define SND_AUX_NUMPARAMETERS 4
 
+#define SND_AUX_REASON_BUFFERUPDATE 0
+#define SND_AUX_REASON_PARAMETERUPDATE 1
+
 typedef struct SND_AUX_INFO {
   union SND_AUX_DATA {
     struct SND_AUX_BUFFERUPDATE {
@@ -73,6 +76,31 @@ typedef struct SND_AUX_REVERBHI {
   f32 crosstalk;
 } SND_AUX_REVERBHI;
 
+void sndAuxCallbackReverbHI(u8 reason, SND_AUX_INFO* info, void* user);
+bool8 sndAuxCallbackPrepareReverbHI(SND_AUX_REVERBHI *rev);
+bool8 sndAuxCallbackShutdownReverbHI(SND_AUX_REVERBHI* rev);
+
+typedef struct SND_AUX_DELAY {
+  u32 currentSize[3];
+  u32 currentPos[3];
+  u32 currentFeedback[3];
+  u32 currentOutput[3];
+
+  s32* left;
+  s32* right;
+  s32* sur;
+
+  u32 delay[3];    // Delay buffer length in ms per channel
+  u32 feedback[3]; // Feedback volume in % per channel
+  u32 output[3];   // Output volume in % per channel
+} SND_AUX_DELAY;
+
+
+void sndAuxCallbackDelay(u8 reason,SND_AUX_INFO *info, void *user);
+bool8 sndAuxCallbackUpdateSettingsDelay(SND_AUX_DELAY *delay);
+bool8 sndAuxCallbackPrepareDelay(SND_AUX_DELAY *rev);
+bool8 sndAuxCallbackShutdownDelay(SND_AUX_DELAY* rev);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/obj_files.mk b/obj_files.mk
index c6ba6c21..fa4bb3ea 100644
--- a/obj_files.mk
+++ b/obj_files.mk
@@ -810,7 +810,7 @@ MUSYX_FILES :=\
 	$(BUILD_DIR)/asm/musyx/creverb.o\
 	$(BUILD_DIR)/src/musyx/reverb_fx.o\
 	$(BUILD_DIR)/asm/musyx/reverb.o\
-	$(BUILD_DIR)/asm/musyx/delay_fx.o\
+	$(BUILD_DIR)/src/musyx/delay_fx.o\
 	$(BUILD_DIR)/asm/musyx/chorus_fx.o
 	
 DTK_FILES :=\
diff --git a/src/musyx/delay_fx.c b/src/musyx/delay_fx.c
new file mode 100644
index 00000000..2b6a4b27
--- /dev/null
+++ b/src/musyx/delay_fx.c
@@ -0,0 +1,101 @@
+#include "musyx/musyx_priv.h"
+
+void sndAuxCallbackDelay(u8 reason, SND_AUX_INFO* info, void* user) {
+  s32 curSur;
+  s32 curLeft;
+  s32 curRight;
+  s32 i;
+  s32* leftOffset;
+  s32* surOffset;
+  s32* rightOffset;
+  s32* leftPtr;
+  s32* rightPtr;
+  s32* surPtr;
+  SND_AUX_DELAY* delay;
+
+  switch (reason) {
+  case 0:
+    delay = (SND_AUX_DELAY*)user;
+    leftOffset = delay->left + (delay->currentPos[0] * 160);
+    leftPtr = info->data.bufferUpdate.left;
+    rightPtr = info->data.bufferUpdate.right;
+    rightOffset = delay->right + (delay->currentPos[1] * 160);
+    surPtr = info->data.bufferUpdate.surround;
+    surOffset = delay->sur + (delay->currentPos[2] * 160);
+    for (i = 160; i > 0; --i) {
+      curLeft = *leftOffset;
+      curRight = *rightOffset;
+      curSur = *surOffset;
+      *leftOffset = *leftPtr + ((s32)(curLeft * delay->currentFeedback[0]) >> 7);
+      ++leftOffset;
+      *rightOffset = *rightPtr + ((s32)(curRight * delay->currentFeedback[1]) >> 7);
+      ++rightOffset;
+      *surOffset = *surPtr + ((s32)(curSur * delay->currentFeedback[2]) >> 7);
+      ++surOffset;
+      *leftPtr = (s32)(curLeft * delay->currentOutput[0]) >> 7;
+      ++leftPtr;
+      *rightPtr = (s32)(curRight * delay->currentOutput[1]) >> 7;
+      ++rightPtr;
+      *surPtr = (s32)(curSur * delay->currentOutput[2]) >> 7;
+      ++surPtr;
+    }
+    delay->currentPos[0] = (delay->currentPos[0] + 1) % delay->currentSize[0];
+    delay->currentPos[1] = (delay->currentPos[1] + 1) % delay->currentSize[1];
+    delay->currentPos[2] = (delay->currentPos[2] + 1) % delay->currentSize[2];
+    /* fallthrough */
+  case 1:
+    return;
+  }
+}
+
+bool8 sndAuxCallbackUpdateSettingsDelay(SND_AUX_DELAY* delay) {
+  s32 i;
+  s32* left;
+  s32* right;
+  s32* sur;
+  sndAuxCallbackShutdownDelay(delay);
+
+  for (i = 0; i < 3; ++i) {
+    delay->currentSize[i] = ((delay->delay[i] - 5) * 32 + 159) / 160;
+    delay->currentPos[i] = 0;
+    delay->currentFeedback[i] = (delay->feedback[i] << 7) / 100;
+    delay->currentOutput[i] = (delay->output[i] << 7) / 100;
+  }
+
+  delay->left = (s32*)salMalloc(delay->currentSize[0] * 0x280);
+  delay->right = (s32*)salMalloc(delay->currentSize[1] * 0x280);
+  delay->sur = (s32*)salMalloc(delay->currentSize[2] * 0x280);
+
+  left = delay->left;
+  right = delay->right;
+  sur = delay->sur;
+
+  for (i = 0; i < delay->currentSize[0] * 160; ++i) {
+    *left = 0;
+    ++left;
+  }
+
+  for (i = 0; i < delay->currentSize[1] * 160; ++i) {
+    *right = 0;
+    ++right;
+  }
+  for (i = 0; i < delay->currentSize[2] * 160; ++i) {
+    *sur = 0;
+    ++sur;
+  }
+  return 1;
+}
+
+bool8 sndAuxCallbackPrepareDelay(SND_AUX_DELAY* delay) {
+  delay->left = NULL;
+  return sndAuxCallbackUpdateSettingsDelay(delay);
+}
+
+bool8 sndAuxCallbackShutdownDelay(SND_AUX_DELAY* delay) {
+  if (delay->left != NULL) {
+    salFree(delay->left);
+    salFree(delay->right);
+    salFree(delay->sur);
+  }
+  return 1;
+}
diff --git a/src/musyx/reverb_fx.c b/src/musyx/reverb_fx.c
index dfd8c8b2..82a3478b 100644
--- a/src/musyx/reverb_fx.c
+++ b/src/musyx/reverb_fx.c
@@ -1,20 +1,16 @@
 #include "musyx/musyx_priv.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-    
+  
 extern bool8 ReverbHICreate(_SND_REVHI_WORK* rev, f32 coloration, f32 time, f32 mix, f32 damping, f32 preDelay, f32 crosstalk);
 extern void ReverbHIFree(_SND_REVHI_WORK* rev);
 
 void sndAuxCallbackReverbHI(u8 reason, SND_AUX_INFO* info, void* user) {
     switch (reason) {
-    case 0:
-        if (*((u8*)user + 0x1c4) == 0) {
+    case SND_AUX_REASON_BUFFERUPDATE:
+        if (((SND_AUX_REVERBHI*)user)->tempDisableFX == 0) {
             ReverbHICallback(info->data.bufferUpdate.left, info->data.bufferUpdate.right, info->data.bufferUpdate.surround, user);
         }
         /* fallthrough */
-    case 1:
+    case SND_AUX_REASON_PARAMETERUPDATE:
         return;
     }
 }
@@ -28,8 +24,3 @@ bool8 sndAuxCallbackShutdownReverbHI(SND_AUX_REVERBHI* rev) {
     ReverbHIFree(&rev->rv);
     return 1;
 }
-
-
-#ifdef __cplusplus
-}
-#endif