diff --git a/nanos-lite/include/device.h b/nanos-lite/include/device.h
index 9e73f65..f3203db 100644
--- a/nanos-lite/include/device.h
+++ b/nanos-lite/include/device.h
@@ -8,6 +8,13 @@ size_t events_read(void *buf, size_t offset, size_t len);
 size_t dispinfo_read(void *buf, size_t offset, size_t len);
 size_t fb_write(const void *buf, size_t offset, size_t len);
 
+
+size_t sb_write(const void *buf, size_t offset, size_t len);
+// freq, channels, samples
+size_t sbctl_write(const void *buf, size_t offset, size_t len);
+// the number of sound buffer unused length
+size_t sbctl_read(void *buf, size_t offset, size_t len);
+
 int _fb_size();
 
 #endif
\ No newline at end of file
diff --git a/nanos-lite/src/device.c b/nanos-lite/src/device.c
index 577e0fe..ff3f957 100644
--- a/nanos-lite/src/device.c
+++ b/nanos-lite/src/device.c
@@ -49,6 +49,26 @@ size_t fb_write(const void *buf, size_t offset, size_t len) {
   return len;
 }
 
+size_t sb_write(const void *buf, size_t offset, size_t len) {
+  Area sbuf = {
+    .start = (char*)buf,
+    .end = (char*)buf + len
+  };
+  io_write(AM_AUDIO_PLAY, sbuf);
+  return len;
+}
+
+size_t sbctl_write(const void *buf, size_t offset, size_t len) {
+  io_write(AM_AUDIO_CTRL, ((int32_t*)buf)[0], ((int32_t*)buf)[1], ((int32_t*)buf)[2]);
+  return 12;
+}
+
+size_t sbctl_read(void *buf, size_t offset, size_t len) {
+  int szbuf = io_read(AM_AUDIO_CONFIG).bufsize;
+  *(int32_t*)buf = szbuf - io_read(AM_AUDIO_STATUS).count;
+  return 4;
+}
+
 int _fb_size() {
   AM_GPU_CONFIG_T gconf = io_read(AM_GPU_CONFIG);
   return gconf.vmemsz;
diff --git a/nanos-lite/src/fs.c b/nanos-lite/src/fs.c
index 0d89504..9c2bfaa 100644
--- a/nanos-lite/src/fs.c
+++ b/nanos-lite/src/fs.c
@@ -15,7 +15,7 @@ typedef struct {
 } Finfo;
 
 enum {FD_STDIN, FD_STDOUT, FD_STDERR,
-  FD_DEV_EVENTS, FD_DEV_FB,
+  FD_DEV_EVENTS, FD_DEV_FB, FD_DEV_SB, FD_DEV_SBCTL,
   FD_PROC_DISPINFO};
 
 size_t invalid_read(void *buf, size_t offset, size_t len) {
@@ -36,6 +36,8 @@ static Finfo file_table[] __attribute__((used)) = {
   [FD_DEV_EVENTS] = {"/dev/events", 0, 0, events_read, invalid_write},
   [FD_DEV_FB] = {"/dev/fb", 0, 0, invalid_read, fb_write},
   [FD_PROC_DISPINFO] = {"/proc/dispinfo", 0, 0, dispinfo_read, invalid_write},
+  [FD_DEV_SB] = {"/dev/sb", 0, 0, invalid_read, sb_write},
+  [FD_DEV_SBCTL] = {"/dev/sbctl", 0, 0, sbctl_read, sbctl_write},
 #include "files.h"
 };
 
diff --git a/navy-apps/libs/libminiSDL/src/audio.c b/navy-apps/libs/libminiSDL/src/audio.c
index 547087b..053419d 100644
--- a/navy-apps/libs/libminiSDL/src/audio.c
+++ b/navy-apps/libs/libminiSDL/src/audio.c
@@ -2,10 +2,13 @@
 #include <SDL.h>
 
 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) {
+  NDL_OpenAudio(desired->freq, desired->channels, desired->samples);
+  // desired->callback()
   return 0;
 }
 
 void SDL_CloseAudio() {
+  NDL_CloseAudio();
 }
 
 void SDL_PauseAudio(int pause_on) {
diff --git a/navy-apps/libs/libndl/NDL.c b/navy-apps/libs/libndl/NDL.c
index b40442d..03e71fd 100644
--- a/navy-apps/libs/libndl/NDL.c
+++ b/navy-apps/libs/libndl/NDL.c
@@ -103,17 +103,43 @@ void NDL_DrawRect(uint32_t *pixels, int x, int y, int w, int h) {
 }
 
 void NDL_OpenAudio(int freq, int channels, int samples) {
+  FILE* fp = fopen("/dev/sbctl", "w");
+  if (fp == NULL) {
+    printf("cannot open /dev/fb");
+    exit(-1);
+  }
+  int arr[] = {
+    freq, channels, samples
+  };
+  fwrite(arr, sizeof(int), 3, fp);
+  fclose(fp);
 }
 
 void NDL_CloseAudio() {
+  
 }
 
 int NDL_PlayAudio(void *buf, int len) {
-  return 0;
+  FILE* fp = fopen("/dev/sb", "w");
+  if (fp == NULL) {
+    printf("cannot open /dev/fb");
+    exit(-1);
+  }
+  fwrite(buf, 1, len, fp);
+  fclose(fp);
+  return len;
 }
 
 int NDL_QueryAudio() {
-  return 0;
+  FILE* fp = fopen("/dev/sbctl", "r");
+  if (fp == NULL) {
+    printf("cannot open /dev/fb");
+    exit(-1);
+  }
+  int ret;
+  fread(&ret, sizeof(int), 1, fp);
+  fclose(fp);
+  return ret;
 }
 
 int NDL_Init(uint32_t flags) {