diff --git a/src/currah_microspeech.c b/src/currah_microspeech.c
index 628e7bd..f1f577b 100644
--- a/src/currah_microspeech.c
+++ b/src/currah_microspeech.c
@@ -23,7 +23,7 @@
 #include "emulator.h"
 
 int allophone_lenght[ALLOPHONES];
-unsigned char *allophone_buffer[ALLOPHONES];
+signed char *allophone_buffer[ALLOPHONES];
 
 char *allophone_list[] = {"pa1","pa2","pa3","pa4","pa5","oy","ay","eh","kk3","pp","jh","nn1","ih","tt2","rr1",
 "ax","mm","tt1","dh1","iy","ey","dd1","uw1","ao","aa","yy2","ae","hh1","bb1","th","uh","uw2","aw","dd2","gg3","vv",
@@ -32,7 +32,7 @@ char *allophone_list[] = {"pa1","pa2","pa3","pa4","pa5","oy","ay","eh","kk3","pp
 
 void currah_microspeech_init() {
 	
-	int i,b;
+	int i;
 	FILE *fichero;
 	char allophone_name[16];
 	
@@ -44,7 +44,7 @@ void currah_microspeech_init() {
 	
 	for (i=0; i<ALLOPHONES; i++)
 	{
-		sprintf(allophone_name, "fbzx/allophones/%s.wav",allophone_list[i]);	
+		sprintf(allophone_name, "fbzx/allophones/%s.raw",allophone_list[i]);	
 		
 		fichero=myfopen(allophone_name,"rb");
 		if(fichero==NULL) {
@@ -56,7 +56,7 @@ void currah_microspeech_init() {
 		allophone_lenght[i]=ftell (fichero);
 		fseek (fichero, 0, SEEK_SET);
 	
-		allophone_buffer[i]= (unsigned char *) malloc(allophone_lenght[i]);
+		allophone_buffer[i]= (signed char *) malloc(allophone_lenght[i]);
 	
 		if (allophone_buffer[i]==NULL) {
 			printf("Can't allocate allophone: %d\n",i);
@@ -69,8 +69,7 @@ void currah_microspeech_init() {
 	}
       
 for (i=0; i<5; i++)
-		for (b=0; b<allophone_lenght[i]; b++)
-			allophone_buffer[i][b]=0x80;
+		memset(allophone_buffer[i], 0x00, allophone_lenght[i]); 
 }
 
 void currah_microspeech_fini() {
diff --git a/src/currah_microspeech.h b/src/currah_microspeech.h
index 247ccfe..f1f7e13 100644
--- a/src/currah_microspeech.h
+++ b/src/currah_microspeech.h
@@ -28,7 +28,7 @@
 #define ALLOPHONES 64
 
 extern int allophone_lenght[ALLOPHONES];
-extern unsigned char *allophone_buffer[ALLOPHONES];
+extern signed char *allophone_buffer[ALLOPHONES];
 
 void currah_microspeech_init();
 void currah_microspeech_reset();
diff --git a/src/spk_ay.c b/src/spk_ay.c
index 500e34b..7f81feb 100644
--- a/src/spk_ay.c
+++ b/src/spk_ay.c
@@ -368,8 +368,8 @@ inline void play_sound (unsigned int tstados) {
 		{
 			if ((ordenador.currah_active)&&(!ordenador.turbo_state))
 			{
-				*ordenador.current_buffer =	(rvalue_sum/N_SAMPLES+((unsigned int)allophone_buffer[ordenador.current_allophone][ordenador.allophone_sound_cuantity/INTONATION_INCREASE])*ordenador.volume*4)<<16
-				|(lvalue_sum/N_SAMPLES+((unsigned int)allophone_buffer[ordenador.current_allophone][ordenador.allophone_sound_cuantity/INTONATION_INCREASE])*ordenador.volume*4);
+				*ordenador.current_buffer =	((((int)(rvalue_sum/N_SAMPLES)+((int)allophone_buffer[ordenador.current_allophone][ordenador.allophone_sound_cuantity/INTONATION_INCREASE])*(int)ordenador.volume*4)<<16)&0XFFFF0000)
+				|(((int)(lvalue_sum/N_SAMPLES)+((int)allophone_buffer[ordenador.current_allophone][ordenador.allophone_sound_cuantity/INTONATION_INCREASE])*(int)ordenador.volume*4)&0X0000FFFF);
 
 				if(!ordenador.intonation_allophone) ordenador.allophone_sound_cuantity+=INTONATION_INCREASE; else ordenador.allophone_sound_cuantity+=INTONATION_INCREASE+1; //The freq increase should be gradual