diff --git a/cart/c/null0.h b/cart/c/null0.h
index e51fd6f..54a4857 100755
--- a/cart/c/null0.h
+++ b/cart/c/null0.h
@@ -54,48 +54,50 @@ typedef struct {
   i32 height;
 } Rectangle;
 
-typedef struct {
+// Sound parameters (96 bytes matching rFXGen WaveParams)
+typedef struct SfxParams {
   // Random seed used to generate the wave
-  u32 randSeed;
+  uint32_t randSeed;
 
   // Wave type (square, sawtooth, sine, noise)
-  i32 waveType;
+  int waveType;
 
   // Wave envelope parameters
-  f32 attackTime;
-  f32 sustainTime;
-  f32 sustainPunch;
-  f32 decayTime;
+  float attackTime;
+  float sustainTime;
+  float sustainPunch;
+  float decayTime;
 
   // Frequency parameters
-  f32 startFrequency;
-  f32 minFrequency;
-  f32 slide;
-  f32 deltaSlide;
-  f32 vibratoDepth;
-  f32 vibratoSpeed;
+  float startFrequency;
+  float minFrequency;
+  float slide;
+  float deltaSlide;
+  float vibratoDepth;
+  float vibratoSpeed;
+  // float vibratoPhaseDelay;      // Unused in sfxr code.
 
   // Tone change parameters
-  f32 changeAmount;
-  f32 changeSpeed;
+  float changeAmount;
+  float changeSpeed;
 
   // Square wave parameters
-  f32 squareDuty;
-  f32 dutySweep;
+  float squareDuty;
+  float dutySweep;
 
   // Repeat parameters
-  f32 repeatSpeed;
+  float repeatSpeed;
 
   // Phaser parameters
-  f32 phaserOffset;
-  f32 phaserSweep;
+  float phaserOffset;
+  float phaserSweep;
 
   // Filter parameters
-  f32 lpfCutoff;
-  f32 lpfCutoffSweep;
-  f32 lpfResonance;
-  f32 hpfCutoff;
-  f32 hpfCutoffSweep;
+  float lpfCutoff;
+  float lpfCutoffSweep;
+  float lpfResonance;
+  float hpfCutoff;
+  float hpfCutoffSweep;
 } SfxParams;
 
 typedef struct {
diff --git a/cart/c/sound/assets/apache.ogg b/cart/c/sound/assets/apache.ogg
deleted file mode 100755
index 554f617..0000000
Binary files a/cart/c/sound/assets/apache.ogg and /dev/null differ
diff --git a/cart/c/sound/main.c b/cart/c/sound/main.c
index 303f8fa..1d23023 100755
--- a/cart/c/sound/main.c
+++ b/cart/c/sound/main.c
@@ -2,49 +2,14 @@
 
 u32 audioLogo;
 u32 sfx;
-u32 apache;
 SfxParams* params;
 
 u32 preloaded_sfx;
 u32 fileloaded_sfx;
 
-// debug function to print a SfxParams
-void print_sfx(SfxParams sfx_params) {
-  trace("(SfxParams) {\n\
-  .randSeed=%lu,\n\
-  .waveType=%d,\n\
-  .attackTime=%ff,\n\
-  .sustainTime=%ff,\n\
-  .sustainPunch=%ff,\n\
-  .decayTime=%ff,\n\
-  .startFrequency=%ff,\n\
-  .minFrequency=%ff,\n\
-  .slide=%ff,\n\
-  .deltaSlide=%ff,\n\
-  .vibratoDepth=%ff,\n\
-  .vibratoSpeed=%ff,\n\
-  .changeAmount=%ff,\n\
-  .changeSpeed=%ff,\n\
-  .squareDuty=%ff,\n\
-  .dutySweep=%ff,\n\
-  .repeatSpeed=%ff,\n\
-  .phaserOffset=%ff,\n\
-  .phaserSweep=%ff,\n\
-  .lpfCutoff=%ff,\n\
-  .lpfCutoffSweep=%ff,\n\
-  .lpfResonance=%ff,\n\
-  .hpfCutoff=%ff,\n\
-  .hpfCutoffSweep=%ff \n\
-}",
-      (unsigned long)sfx_params.randSeed, sfx_params.waveType, sfx_params.attackTime, sfx_params.sustainTime, sfx_params.sustainPunch, sfx_params.decayTime, sfx_params.startFrequency, sfx_params.minFrequency, sfx_params.slide, sfx_params.deltaSlide, sfx_params.vibratoDepth, sfx_params.vibratoSpeed, sfx_params.changeAmount, sfx_params.changeSpeed, sfx_params.squareDuty, sfx_params.dutySweep, sfx_params.repeatSpeed, sfx_params.phaserOffset, sfx_params.phaserSweep, sfx_params.lpfCutoff, sfx_params.lpfCutoffSweep, sfx_params.lpfResonance, sfx_params.hpfCutoff, sfx_params.hpfCutoffSweep);
-}
-
 int main() {
   trace("Hello from sound.");
 
-  apache = load_sound("assets/apache.ogg");
-  // play_sound(apache, true);
-
   audioLogo = load_sound("assets/notnullgames.ogg");
 
   params = malloc(sizeof(SfxParams));
@@ -76,16 +41,14 @@ int main() {
     .lpfCutoffSweep=0.000000f,
     .lpfResonance=0.000000f,
     .hpfCutoff=0.000000f,
-    .hpfCutoffSweep=0.000000f 
+    .hpfCutoffSweep=0.000000f
   };
   preloaded_sfx = new_sfx(&preloaded);
 
   // load a SFX from a file
-  // currently this is broke
-  // SfxParams* fileloaded = malloc(96);
-  // load_sfx(fileloaded, "assets/sound.rfx");
-  // fileloaded_sfx = new_sfx(fileloaded);
-  // print_sfx(*fileloaded);
+  SfxParams* fileloaded = malloc(96);
+  load_sfx(fileloaded, "assets/sound.rfx");
+  fileloaded_sfx = new_sfx(fileloaded);
 
   return 0;
 }
@@ -98,7 +61,7 @@ void update() {
   draw_text(0, "Press X for coin sound.", 65, HEIGHT / 2 - 20, RAYWHITE);
   draw_text(0, "Press Y for hurt sound.", 65, HEIGHT / 2, RAYWHITE);
   draw_text(0, "Press START for hardcoded sfx struct", 18, HEIGHT / 2 + 20, RAYWHITE);
-  // draw_text(0, "Press SELECT for file sfx", 45, HEIGHT / 2 + 40, RAYWHITE);
+  draw_text(0, "Press SELECT for file sfx", 45, HEIGHT / 2 + 40, RAYWHITE);
 }
 
 NULL0_EXPORT("buttonDown")
@@ -112,28 +75,25 @@ void buttonDown(GamepadButton button) {
     preset_sfx(params, SFX_POWERUP);
     sfx = new_sfx(params);
     play_sound(sfx, false);
-    // print_sfx(*params);
   }
   if (button == GAMEPAD_BUTTON_X) {
     unload_sound(sfx);
     preset_sfx(params, SFX_COIN);
     sfx = new_sfx(params);
     play_sound(sfx, false);
-    // print_sfx(*params);
   }
   if (button == GAMEPAD_BUTTON_Y) {
     unload_sound(sfx);
     preset_sfx(params, SFX_HURT);
     sfx = new_sfx(params);
     play_sound(sfx, false);
-    // print_sfx(*params);
   }
 
   if (button == GAMEPAD_BUTTON_START) {
     play_sound(preloaded_sfx, false);
   }
 
-  // if (button == GAMEPAD_BUTTON_SELECT) {
-  //   play_sound(fileloaded_sfx, false);
-  // }
-}
\ No newline at end of file
+  if (button == GAMEPAD_BUTTON_SELECT) {
+    play_sound(fileloaded_sfx, false);
+  }
+}
diff --git a/docs/cart/colorbars.null0 b/docs/cart/colorbars.null0
index c5e48a0..e6d2c1b 100644
Binary files a/docs/cart/colorbars.null0 and b/docs/cart/colorbars.null0 differ
diff --git a/docs/cart/draw.null0 b/docs/cart/draw.null0
index b9eefa4..7d1b48d 100644
Binary files a/docs/cart/draw.null0 and b/docs/cart/draw.null0 differ
diff --git a/docs/cart/filesystem.null0 b/docs/cart/filesystem.null0
index 8a1f73f..e105570 100644
Binary files a/docs/cart/filesystem.null0 and b/docs/cart/filesystem.null0 differ
diff --git a/docs/cart/flappybird.null0 b/docs/cart/flappybird.null0
index 91cc864..e328959 100644
Binary files a/docs/cart/flappybird.null0 and b/docs/cart/flappybird.null0 differ
diff --git a/docs/cart/hello.null0 b/docs/cart/hello.null0
index f82ff71..8e8a3d4 100644
Binary files a/docs/cart/hello.null0 and b/docs/cart/hello.null0 differ
diff --git a/docs/cart/input.null0 b/docs/cart/input.null0
index 74c81c2..f60d7e6 100644
Binary files a/docs/cart/input.null0 and b/docs/cart/input.null0 differ
diff --git a/docs/cart/justlog.null0 b/docs/cart/justlog.null0
index 559e7fb..5772fe9 100644
Binary files a/docs/cart/justlog.null0 and b/docs/cart/justlog.null0 differ
diff --git a/docs/cart/sound.null0 b/docs/cart/sound.null0
index f7b43e1..ad89534 100644
Binary files a/docs/cart/sound.null0 and b/docs/cart/sound.null0 differ
diff --git a/docs/cart/tracker.null0 b/docs/cart/tracker.null0
index 31ef775..df0e12b 100644
Binary files a/docs/cart/tracker.null0 and b/docs/cart/tracker.null0 differ
diff --git a/docs/cart/typesizes.null0 b/docs/cart/typesizes.null0
index c669019..f7cf8c2 100644
Binary files a/docs/cart/typesizes.null0 and b/docs/cart/typesizes.null0 differ
diff --git a/docs/wasm/null0.wasm b/docs/wasm/null0.wasm
index 03f53a0..dec5606 100755
Binary files a/docs/wasm/null0.wasm and b/docs/wasm/null0.wasm differ
diff --git a/null0_api/src/null0_api_sound.h b/null0_api/src/null0_api_sound.h
index dfeb4fd..3529416 100755
--- a/null0_api/src/null0_api_sound.h
+++ b/null0_api/src/null0_api_sound.h
@@ -93,3 +93,34 @@ void null0_mutate_sfx(SfxParams* params, float range, uint32_t mask) {
 void null0_load_sfx(SfxParams* params, char* filename) {
   pntr_app_sfx_load_params(params, filename);
 }
+
+// debug function to print a SfxParams
+void print_sfx(SfxParams sfx_params) {
+  printf("(SfxParams) {\n\
+  .randSeed=%lu,\n\
+  .waveType=%d,\n\
+  .attackTime=%ff,\n\
+  .sustainTime=%ff,\n\
+  .sustainPunch=%ff,\n\
+  .decayTime=%ff,\n\
+  .startFrequency=%ff,\n\
+  .minFrequency=%ff,\n\
+  .slide=%ff,\n\
+  .deltaSlide=%ff,\n\
+  .vibratoDepth=%ff,\n\
+  .vibratoSpeed=%ff,\n\
+  .changeAmount=%ff,\n\
+  .changeSpeed=%ff,\n\
+  .squareDuty=%ff,\n\
+  .dutySweep=%ff,\n\
+  .repeatSpeed=%ff,\n\
+  .phaserOffset=%ff,\n\
+  .phaserSweep=%ff,\n\
+  .lpfCutoff=%ff,\n\
+  .lpfCutoffSweep=%ff,\n\
+  .lpfResonance=%ff,\n\
+  .hpfCutoff=%ff,\n\
+  .hpfCutoffSweep=%ff \n\
+}\n",
+      (unsigned long)sfx_params.randSeed, sfx_params.waveType, sfx_params.attackTime, sfx_params.sustainTime, sfx_params.sustainPunch, sfx_params.decayTime, sfx_params.startFrequency, sfx_params.minFrequency, sfx_params.slide, sfx_params.deltaSlide, sfx_params.vibratoDepth, sfx_params.vibratoSpeed, sfx_params.changeAmount, sfx_params.changeSpeed, sfx_params.squareDuty, sfx_params.dutySweep, sfx_params.repeatSpeed, sfx_params.phaserOffset, sfx_params.phaserSweep, sfx_params.lpfCutoff, sfx_params.lpfCutoffSweep, sfx_params.lpfResonance, sfx_params.hpfCutoff, sfx_params.hpfCutoffSweep);
+}
diff --git a/null0_api/src/null0_api_wamr.h b/null0_api/src/null0_api_wamr.h
index 1811c75..f559ce4 100755
--- a/null0_api/src/null0_api_wamr.h
+++ b/null0_api/src/null0_api_wamr.h
@@ -134,10 +134,9 @@ static void wamr_null0_mutate_sfx(wasm_exec_env_t exec_env, SfxParams* params, f
 
 // Create a new sfxr from a .rfx file
 static void wamr_null0_load_sfx(wasm_exec_env_t exec_env, SfxParams* params, char* filename) {
-  SfxParams* hostRet = malloc(96);
-  null0_load_sfx(hostRet, filename);
-  memcpy(params, hostRet, 96);
-  free(hostRet);
+  SfxParams p = {};
+  null0_load_sfx(&p, filename);
+  memcpy(params, &p, sizeof(SfxParams));
 }
 
 // Unload a sound
@@ -682,7 +681,7 @@ static NativeSymbol null0_wamr_callbacks[] = {
     {"mouse_button_released", wamr_null0_mouse_button_released, "(i)i"},
     {"mouse_button_up", wamr_null0_mouse_button_up, "(i)i"},
     {"new_image", wamr_null0_new_image, "(ii*)i"},
-    {"image_copy", wamr_null0_image_copy, "(i)i"}, 
+    {"image_copy", wamr_null0_image_copy, "(i)i"},
     {"image_subimage", wamr_null0_image_subimage, "(iiiii)i"},
     {"clear", wamr_null0_clear, "(*)"},
     {"draw_point", wamr_null0_draw_point, "(ii*)"},