diff --git a/linuxdoom-1.10/i_sound.c b/linuxdoom-1.10/i_sound.c
index 18d8a55..7bdf6fe 100644
--- a/linuxdoom-1.10/i_sound.c
+++ b/linuxdoom-1.10/i_sound.c
@@ -1,12 +1,412 @@
 #ifdef _WIN32
-char*	sndserver_filename = "./sndserver ";
+
+#define SAMPLECOUNT		512
+#define NUM_CHANNELS		8
+// It is 2 for 16bit, and 2 for two channels.
+#define BUFMUL                  4
+#define MIXBUFFERSIZE		(SAMPLECOUNT*BUFMUL)
+
+#define SAMPLERATE		11025	// Hz
+#define SAMPLESIZE		2   	// 16bit
+
+signed short	mixbuffer[MIXBUFFERSIZE];
+
+int 		lengths[NUMSFX];
+
+// The channel data pointers, start and end.
+unsigned char*	channels[NUM_CHANNELS];
+unsigned char*	channelsend[NUM_CHANNELS];
+
+
+// Time/gametic that the channel started playing,
+//  used to determine oldest, which automatically
+//  has lowest priority.
+// In case number of active sounds exceeds
+//  available channels.
+int		channelstart[NUM_CHANNELS];
+
+// The sound in channel handles,
+//  determined on registration,
+//  might be used to unregister/stop/modify,
+//  currently unused.
+int 		channelhandles[NUM_CHANNELS];
+
+// The channel step amount...
+unsigned int	channelstep[NUM_CHANNELS];
+// ... and a 0.16 bit remainder of last step.
+unsigned int	channelstepremainder[NUM_CHANNELS];
+
+
+// SFX id of the playing sound effect.
+// Used to catch duplicates (like chainsaw).
+int		channelids[NUM_CHANNELS];			
+
+// Volume lookups.
+int		vol_lookup[128*256];
+
+// Pitch to stepping lookup, unused.
+int		steptable[256];
+
+// Hardware left and right channel volume lookup.
+int*		channelleftvol_lookup[NUM_CHANNELS];
+int*		channelrightvol_lookup[NUM_CHANNELS];
+
+
+//
+// This function loads the sound data from the WAD lump,
+//  for single sound.
+//
+void*
+getsfx
+( char*         sfxname,
+  int*          len )
+{
+    unsigned char*      sfx;
+    unsigned char*      paddedsfx;
+    int                 i;
+    int                 size;
+    int                 paddedsize;
+    char                name[20];
+    int                 sfxlump;
+
+    
+    // Get the sound data from the WAD, allocate lump
+    //  in zone memory.
+    sprintf(name, "ds%s", sfxname);
+
+    // Now, there is a severe problem with the
+    //  sound handling, in it is not (yet/anymore)
+    //  gamemode aware. That means, sounds from
+    //  DOOM II will be requested even with DOOM
+    //  shareware.
+    // The sound list is wired into sounds.c,
+    //  which sets the external variable.
+    // I do not do runtime patches to that
+    //  variable. Instead, we will use a
+    //  default sound for replacement.
+    if ( W_CheckNumForName(name) == -1 )
+      sfxlump = W_GetNumForName("dspistol");
+    else
+      sfxlump = W_GetNumForName(name);
+    
+    size = W_LumpLength( sfxlump );
+
+    // Debug.
+    // fprintf( stderr, "." );
+    //fprintf( stderr, " -loading  %s (lump %d, %d bytes)\n",
+    //	     sfxname, sfxlump, size );
+    //fflush( stderr );
+    
+    sfx = (unsigned char*)W_CacheLumpNum( sfxlump, PU_STATIC );
+
+    // Pads the sound effect out to the mixing buffer size.
+    // The original realloc would interfere with zone memory.
+    paddedsize = ((size-8 + (SAMPLECOUNT-1)) / SAMPLECOUNT) * SAMPLECOUNT;
+
+    // Allocate from zone memory.
+    paddedsfx = (unsigned char*)Z_Malloc( paddedsize+8, PU_STATIC, 0 );
+    // ddt: (unsigned char *) realloc(sfx, paddedsize+8);
+    // This should interfere with zone memory handling,
+    //  which does not kick in in the soundserver.
+
+    // Now copy and pad.
+    memcpy(  paddedsfx, sfx, size );
+    for (i=size ; i<paddedsize+8 ; i++)
+        paddedsfx[i] = 128;
+
+    // Remove the cached lump.
+    Z_Free( sfx );
+    
+    // Preserve padded length.
+    *len = paddedsize;
+
+    // Return allocated padded data.
+    return (void *) (paddedsfx + 8);
+}
+
+
+
+
+int
+addsfx
+( int		sfxid,
+  int		volume,
+  int		step,
+  int		seperation )
+{
+    static unsigned short	handlenums = 0;
+ 
+    int		i;
+    int		rc = -1;
+    
+    int		oldest = gametic;
+    int		oldestnum = 0;
+    int		slot;
+
+    int		rightvol;
+    int		leftvol;
+
+    // Chainsaw troubles.
+    // Play these sound effects only one at a time.
+    if ( sfxid == sfx_sawup
+	 || sfxid == sfx_sawidl
+	 || sfxid == sfx_sawful
+	 || sfxid == sfx_sawhit
+	 || sfxid == sfx_stnmov
+	 || sfxid == sfx_pistol	 )
+    {
+	// Loop all channels, check.
+	for (i=0 ; i<NUM_CHANNELS ; i++)
+	{
+	    // Active, and using the same SFX?
+	    if ( (channels[i])
+		 && (channelids[i] == sfxid) )
+	    {
+		// Reset.
+		channels[i] = 0;
+		// We are sure that iff,
+		//  there will only be one.
+		break;
+	    }
+	}
+    }
+
+    // Loop all channels to find oldest SFX.
+    for (i=0; (i<NUM_CHANNELS) && (channels[i]); i++)
+    {
+	if (channelstart[i] < oldest)
+	{
+	    oldestnum = i;
+	    oldest = channelstart[i];
+	}
+    }
+
+    // Tales from the cryptic.
+    // If we found a channel, fine.
+    // If not, we simply overwrite the first one, 0.
+    // Probably only happens at startup.
+    if (i == NUM_CHANNELS)
+	slot = oldestnum;
+    else
+	slot = i;
+
+    // Okay, in the less recent channel,
+    //  we will handle the new SFX.
+    // Set pointer to raw data.
+    channels[slot] = (unsigned char *) S_sfx[sfxid].data;
+    // Set pointer to end of raw data.
+    channelsend[slot] = channels[slot] + lengths[sfxid];
+
+    // Reset current handle number, limited to 0..100.
+    if (!handlenums)
+	handlenums = 100;
+
+    // Assign current handle number.
+    // Preserved so sounds could be stopped (unused).
+    channelhandles[slot] = rc = handlenums++;
+
+    // Set stepping???
+    // Kinda getting the impression this is never used.
+    channelstep[slot] = step;
+    // ???
+    channelstepremainder[slot] = 0;
+
+    // Should be gametic, I presume.
+    channelstart[slot] = gametic;
+
+    // Separation, that is, orientation/stereo.
+    //  range is: 1 - 256
+    seperation += 1;
+
+    // Per left/right channel.
+    //  x^2 seperation,
+    //  adjust volume properly.
+    leftvol =
+	volume - ((volume*seperation*seperation) >> 16); ///(256*256);
+    seperation = seperation - 257;
+    rightvol =
+	volume - ((volume*seperation*seperation) >> 16);	
+
+    // Sanity check, clamp volume.
+    if (rightvol < 0 || rightvol > 127)
+	I_Error("rightvol out of bounds");
+    
+    if (leftvol < 0 || leftvol > 127)
+	I_Error("leftvol out of bounds");
+  
+    // Get the proper lookup table piece
+    //  for this volume level???
+    channelleftvol_lookup[slot] = &vol_lookup[leftvol*256];
+    channelrightvol_lookup[slot] = &vol_lookup[rightvol*256];
+
+    // Preserve sound SFX id,
+    //  e.g. for avoiding duplicates of chainsaw.
+    channelids[slot] = sfxid;
+
+    // You tell me.
+    return rc;
+}
 
 
 // Init at program start...
-void I_InitSound(){}
+void I_InitSound(){
+    int i;
+    
+  // Initialize external data (all sounds) at start, keep static.
+  fprintf( stderr, "I_InitSound: ");
+  
+  for (i=1 ; i<NUMSFX ; i++)
+  { 
+    // Alias? Example is the chaingun sound linked to pistol.
+    if (!S_sfx[i].link)
+    {
+      // Load data from WAD file.
+      S_sfx[i].data = getsfx( S_sfx[i].name, &lengths[i] );
+    }	
+    else
+    {
+      // Previously loaded already?
+      S_sfx[i].data = S_sfx[i].link->data;
+      lengths[i] = lengths[(S_sfx[i].link - S_sfx)/sizeof(sfxinfo_t)];
+    }
+  }
+
+  fprintf( stderr, " pre-cached all sound data\n");
+}
+
+//
+// This function loops all active (internal) sound
+//  channels, retrieves a given number of samples
+//  from the raw sound data, modifies it according
+//  to the current (internal) channel parameters,
+//  mixes the per channel samples into the global
+//  mixbuffer, clamping it to the allowed range,
+//  and sets up everything for transferring the
+//  contents of the mixbuffer to the (two)
+//  hardware channels (left and right, that is).
+//
+// This function currently supports only 16bit.
+//
+void I_UpdateSound( void )
+{
+#ifdef SNDINTR
+  // Debug. Count buffer misses with interrupt.
+  static int misses = 0;
+#endif
+
+  
+  // Mix current sound data.
+  // Data, from raw sound, for right and left.
+  register unsigned int	sample;
+  register int		dl;
+  register int		dr;
+  
+  // Pointers in global mixbuffer, left, right, end.
+  signed short*		leftout;
+  signed short*		rightout;
+  signed short*		leftend;
+  // Step in mixbuffer, left and right, thus two.
+  int				step;
+
+  // Mixing channel index.
+  int				chan;
+    
+    // Left and right channel
+    //  are in global mixbuffer, alternating.
+    leftout = mixbuffer;
+    rightout = mixbuffer+1;
+    step = 2;
+
+    // Determine end, for left channel only
+    //  (right channel is implicit).
+    leftend = mixbuffer + SAMPLECOUNT*step;
+
+    // Mix sounds into the mixing buffer.
+    // Loop over step*SAMPLECOUNT,
+    //  that is 512 values for two channels.
+    while (leftout != leftend)
+    {
+	// Reset left/right value. 
+	dl = 0;
+	dr = 0;
+
+	// Love thy L2 chache - made this a loop.
+	// Now more channels could be set at compile time
+	//  as well. Thus loop those  channels.
+	for ( chan = 0; chan < NUM_CHANNELS; chan++ )
+	{
+	    // Check channel, if active.
+	    if (channels[ chan ])
+	    {
+		// Get the raw data from the channel. 
+		sample = *channels[ chan ];
+		// Add left and right part
+		//  for this channel (sound)
+		//  to the current data.
+		// Adjust volume accordingly.
+		dl += channelleftvol_lookup[ chan ][sample];
+		dr += channelrightvol_lookup[ chan ][sample];
+		// Increment index ???
+		channelstepremainder[ chan ] += channelstep[ chan ];
+		// MSB is next sample???
+		channels[ chan ] += channelstepremainder[ chan ] >> 16;
+		// Limit to LSB???
+		channelstepremainder[ chan ] &= 65536-1;
+
+		// Check whether we are done.
+		if (channels[ chan ] >= channelsend[ chan ])
+		    channels[ chan ] = 0;
+	    }
+	}
+	
+	// Clamp to range. Left hardware channel.
+	// Has been char instead of short.
+	// if (dl > 127) *leftout = 127;
+	// else if (dl < -128) *leftout = -128;
+	// else *leftout = dl;
+	
+	dl *= 8;
+	dr *= 8;
+
+	if (dl > 0x7fff)
+	    *leftout = 0x7fff;
+	else if (dl < -0x8000)
+	    *leftout = -0x8000;
+	else
+	    *leftout = dl;
+
+	// Same for right hardware channel.
+	if (dr > 0x7fff)
+	    *rightout = 0x7fff;
+	else if (dr < -0x8000)
+	    *rightout = -0x8000;
+	else
+	    *rightout = dr;
+
+	// Increment current pointers in mixbuffer.
+	leftout += step;
+	rightout += step;
+    }
+
+#ifdef SNDINTR
+    // Debug check.
+    if ( flag )
+    {
+      misses += flag;
+      flag = 0;
+    }
+    
+    if ( misses > 10 )
+    {
+      fprintf( stderr, "I_SoundUpdate: missed 10 buffer writes\n");
+      misses = 0;
+    }
+    
+    // Increment flag for update.
+    flag++;
+#endif
+}
 
-// ... update sound buffer and audio device at runtime...
-void I_UpdateSound(void){}
 void I_SubmitSound(void){}
 
 // ... shut down and relase at program termination.
@@ -17,22 +417,82 @@ void I_ShutdownSound(void){}
 //  SFX I/O
 //
 
-// Initialize channels?
-void I_SetChannels(){}
+// SFX API
+// Note: this was called by S_Init.
+// However, whatever they did in the
+// old DPMS based DOS version, this
+// were simply dummies in the Linux
+// version.
+// See soundserver initdata().
+//
+void I_SetChannels()
+{
+  // Init internal lookups (raw data, mixing buffer, channels).
+  // This function sets up internal lookups used during
+  //  the mixing process. 
+  int		i;
+  int		j;
+    
+  int*	steptablemid = steptable + 128;
+  
+  // Okay, reset internal mixing channels to zero.
+  /*for (i=0; i<NUM_CHANNELS; i++)
+  {
+    channels[i] = 0;
+  }*/
+
+  // This table provides step widths for pitch parameters.
+  // I fail to see that this is currently used.
+  for (i=-128 ; i<128 ; i++)
+    steptablemid[i] = (int)(pow(2.0, (i/64.0))*65536.0);
+  
+  
+  // Generates volume lookup tables
+  //  which also turn the unsigned samples
+  //  into signed samples.
+  for (i=0 ; i<128 ; i++)
+    for (j=0 ; j<256 ; j++)
+      vol_lookup[i*256+j] = (i*(j-128)*256)/127;
+}	
 
 // Get raw data lump index for sound descriptor.
-int I_GetSfxLumpNum (struct sfxinfo_t* sfxinfo ){ 
-    return 0; }
+int I_GetSfxLumpNum (struct sfxinfo_t* sfxinfo ){ return 0; }
 
 
-// Starts a sound in a particular sound channel.
+//
+// Starting a sound means adding it
+//  to the current list of active sounds
+//  in the internal channels.
+// As the SFX info struct contains
+//  e.g. a pointer to the raw data,
+//  it is ignored.
+// As our sound handling does not handle
+//  priority, it is ignored.
+// Pitching (that is, increased speed of playback)
+//  is set, but currently not used by mixing.
+//
 int
 I_StartSound
 ( int		id,
   int		vol,
   int		sep,
   int		pitch,
-  int		priority ){ return 0;  }
+  int		priority )
+{
+
+  // UNUSED
+  priority = 0;
+
+  pitch = NORM_PITCH;
+ 
+// Returns a handle (not used).
+id = addsfx( id, vol, steptable[pitch], sep );
+
+// fprintf( stderr, "/handle is %d\n", id );
+    
+return id;
+}
+
 
 
 // Stops a sound channel.
@@ -62,10 +522,20 @@ struct music_t {
     int left_over;
 } music = { NULL, 1, 0 };
 
-void I_InitMusic(void){}
-void I_ShutdownMusic(void){}
+thread_mutex_t mus_mutex;
+
+void I_InitMusic(void){
+}
+
+void I_ShutdownMusic(void){
+}
+int g_volume = 7;
 // Volume.
-void I_SetMusicVolume(int volume){}
+void I_SetMusicVolume(int volume){
+    if( volume < 16 ) {
+        g_volume = volume;
+    }
+}
 // PAUSE game handling.
 void I_PauseSong(int handle){}
 void I_ResumeSong(int handle){}
@@ -80,7 +550,7 @@ void
 I_PlaySong
 ( int		handle,
   int		looping ){
-    
+    thread_mutex_lock( &mus_mutex );
     void* data = (void*)(uintptr_t)handle;
     if( music.mus ) {
         mus_destroy( music.mus );
@@ -90,14 +560,17 @@ I_PlaySong
     music.mus = mus_create( data, size, NULL );
     music.left_over = 0;
     music.reset = 1;
+    thread_mutex_unlock( &mus_mutex );
 }
 // Stops a song over 3 seconds.
 void I_StopSong(int handle){
+    thread_mutex_lock( &mus_mutex );
     // TODO: fadeout
     mus_destroy( music.mus );
     music.mus = NULL;
     music.left_over = 0;
     music.reset = 1;
+    thread_mutex_unlock( &mus_mutex );
 }
 // See above (register), then think backwards
 void I_UnRegisterSong(int handle){}
@@ -105,14 +578,18 @@ void I_UnRegisterSong(int handle){}
 
 
 void render_music( short* sample_pairs, int sample_pairs_count, tsf* sound_font ) {
+    thread_mutex_lock( &mus_mutex );
     mus_t* mus = music.mus;
     if( !mus ) {
         memset( sample_pairs, 0, sizeof( short ) * sample_pairs_count * 2 );
+        thread_mutex_unlock( &mus_mutex );
+        return;
     }
     if( music.reset ) {
         tsf_reset( sound_font );
         music.reset = 0;
     }
+    tsf_set_volume( sound_font, g_volume / 5.0f );
     int left_over_from_previous = music.left_over;
     int remaining = sample_pairs_count;
     short* output = sample_pairs;
@@ -123,12 +600,13 @@ void render_music( short* sample_pairs, int sample_pairs_count, tsf* sound_font
             left_over = count - remaining;
             count = remaining;
         }
-        tsf_render_short( sound_font, output, count, 0 );
+        tsf_render_short( sound_font, output, count, 1 );
         remaining -= count;
         output += count * 2;
     }
     if( left_over ) {
         music.left_over = left_over;
+        thread_mutex_unlock( &mus_mutex );
         return;
     }
 
@@ -216,13 +694,14 @@ void render_music( short* sample_pairs, int sample_pairs_count, tsf* sound_font
                     left_over = count - remaining;
                     count = remaining;
                 }
-                tsf_render_short( sound_font, output, count, 0 );
+                tsf_render_short( sound_font, output, count, 1 );
                 remaining -= count;
                 output += count * 2;
             } break;
         }
     }
     music.left_over = left_over;
+    thread_mutex_unlock( &mus_mutex );
 }
 
 #else
diff --git a/linuxdoom-1.10/i_video.c b/linuxdoom-1.10/i_video.c
index eaea250..d001b6a 100644
--- a/linuxdoom-1.10/i_video.c
+++ b/linuxdoom-1.10/i_video.c
@@ -46,6 +46,14 @@ thread_signal_t vblank_signal;
 
 void sound_callback( APP_S16* sample_pairs, int sample_pairs_count, void* user_data ) {
     tsf* sound_font = (tsf*) user_data;
+    if( sample_pairs_count == SAMPLECOUNT * 4 ) {
+        I_UpdateSound();
+        for( int i = 0; i < SAMPLECOUNT; ++i ) {
+            for( int j = 0; j < 8; ++j ) {
+                sample_pairs[ i * 8 + j ] = mixbuffer[ i * 2 + ( j % 2 ) ];
+            }
+        }
+    }
     render_music( sample_pairs, sample_pairs_count, sound_font );
 }
 
@@ -66,7 +74,7 @@ int app_proc( app_t* app, void* user_data )
     app_pointer( app, 1, 1, &empty, 0, 0 );
 
     tsf* sound_font = tsf_load_memory( soundfont, sizeof( soundfont ) );
-    app_sound( app, 5880, sound_callback, sound_font );
+    app_sound( app, SAMPLECOUNT * 4 * 2, sound_callback, sound_font );
 	
     while( thread_atomic_int_load(&app_running) && app_yield( app ) != APP_STATE_EXIT_REQUESTED )
     {
@@ -98,7 +106,9 @@ int app_proc( app_t* app, void* user_data )
 
 int app_proc_thread()
 {
-    return app_run( app_proc, 0, 0, 0, 0 );
+    thread_mutex_init( &mus_mutex );
+	return app_run( app_proc, 0, 0, 0, 0 );
+    thread_mutex_term( &mus_mutex );
 }
 
 void I_InitGraphics (void)