Rename sound to _sound.

remove extra comments.

include/atari.h

@@ -239,7 +239,7 @@ extern void __fastcall__ _scroll (signed char numlines);
 /*    Sound function                                                         */
 /*****************************************************************************/
 
-extern void  __fastcall__ sound (unsigned char voice, unsigned char frequency, unsigned char distortion, unsigned char volume);  /* plays a sound in the specidied voice, to silence call with in other params*/
+extern void  __fastcall__ _sound (unsigned char voice, unsigned char frequency, unsigned char distortion, unsigned char volume); 
 
 /*****************************************************************************/
 /* Misc. functions                                                           */

libsrc/atari/sound.s

@@ -5,10 +5,10 @@
 ; atari lib
 ;
         .include "atari.inc"
-        .export         _sound
+        .export         __sound
         .import         popa
 ; play sound, arguments: voice, pitch, distortion, volume. same as BASIC
-.proc   _sound
+.proc   __sound
         sta STORE2      ;save volume
         jsr popa        ;get distortion
         sta STORE1      ;save distortion

targettest/atari/sound.c

@@ -1,5 +1,5 @@
 /*
-** testprogram printing the default device
+** Test program for _sound for atari
 **
 **  January 6 2023 Mariano Domínguez
 */
@@ -13,8 +13,8 @@ int main(void)
 {
     int i=0;
     printf("playing sound \n");
-    sound(1,121,10,15);
+    _sound(1,121,10,15); //voice, pitch, distortion, volume
     for(i=0;i<9000;i++);
-    sound(1,0,0,0);
+    _sound(1,0,0,0); //silencing, same as Atari Basic
     return 0;
 }