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Also, if you don't want to create sounds on your own, you can play any of the sound defined in General Midi (128 different instrument sounds including a few sound effects) with soundblaster 16 emulation using something like this:

#include <stdlib.h>
#include "dos.h"
int main(int argc, char *argv[]) {
    setinstrument( 1, 14 );
    setsoundbank( DEFAULT_SOUNDBANK_SB16 );
    int exit = 0;
    while( !exit ) {
        noteon( 1, 52, 127 );
        for( int i = 0; i < 40; ++i ) {
            waitvbl();     
            if( keystate( KEY_ESCAPE ) || shuttingdown() ) {
                exit = 1;
                break;
            }
        }
        noteoff( 1, 52 );
        for( int i = 0; i < 80; ++i ) {
            waitvbl();     
            if( keystate( KEY_ESCAPE )  || shuttingdown() ) {
                exit = 1;
                break;
            }
        }
    }
    return 0;
}