diff -urN ../VisualBoyAdvance-1.7.2-orig/src/sdl/SDL.cpp src/sdl/SDL.cpp
--- ../VisualBoyAdvance-1.7.2-orig/src/sdl/SDL.cpp	2006-12-05 14:05:28 +0900
+++ src/sdl/SDL.cpp	2006-12-05 14:06:41 +0900
@@ -20,6 +20,8 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <errno.h>
+#include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
@@ -257,6 +259,7 @@
 SDL_sem *sdlBufferEmpty = NULL;
 u8 sdlBuffer[4096];
 int sdlSoundLen = 0;
+int soundOutfile = -1;
 
 char *arg0;
 
@@ -359,6 +362,7 @@
   { "save-none", no_argument, &cpuSaveType, 5 },
   { "show-speed-normal", no_argument, &showSpeed, 1 },
   { "show-speed-detailed", no_argument, &showSpeed, 2 },
+  { "sound-outfile", required_argument, 0, 's'<<8|'o' },
   { "throttle", required_argument, 0, 'T' },
   { "verbose", required_argument, 0, 'v' },  
   { "video-1x", no_argument, &sizeOption, 0 },
@@ -2143,6 +2147,19 @@
     case '4':
       sizeOption = 3;
       break;
+    case 's'<<8|'o':
+      if (optarg) {
+        soundOutfile = open(optarg, O_WRONLY|O_CREAT|O_TRUNC, 0666);
+        if (soundOutfile == -1) {
+          fprintf(stderr, "--sound-outfile: open(%s): %s\n", optarg,
+                  strerror(errno));
+          exit(-1);
+        }
+      } else {
+        fprintf(stderr, "Missing argument to --sound-outfile (getopt bug?)\n");
+        exit(-1);
+      }
+      break;
     case '?':
       sdlPrintUsage = 1;
       break;
@@ -2938,6 +2955,8 @@
 
   SDL_SemWait (sdlBufferLock);
   memcpy (stream, sdlBuffer, len);
+  if (soundOutfile != -1)
+    write(soundOutfile, stream, len);
   sdlSoundLen = 0;
   SDL_SemPost (sdlBufferLock);