Вот пример (кстати, создай три кнопки):

#include <mmsystem.h>

...

DWORD wav[0x1000B] = { 0x46464952,0x00040024,0x45564157,0x20746D66,
                       0x00000010,0x00020001,0x00005622,0x00015888,
                       0x00100004,0x61746164,0x00040000 };

//-----------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    for( int i = 0; i < 0x10000; i += 0x800 ) {
        wav[i+11] = 0x7FFF;
        wav[i+11+100] = 0x7FFF0000;
        }

    PlaySound( LPCSTR(wav), 0, SND_LOOP | SND_ASYNC | SND_MEMORY );
    Sleep( 10000 );
}
//-----------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
    for( int i = 0; i < 0x10000; i += 0x800 ) {
        wav[i+11] = 0x7FFF;
        wav[i+11+(i - 0x8000)*100/0x8000] |= 0x7FFF0000;
        }

    PlaySound( LPCSTR(wav), 0, SND_LOOP | SND_ASYNC | SND_MEMORY );
    Sleep( 10000 );
}
//-----------------------------
void __fastcall TForm1::Button3Click(TObject *Sender)
{
         int drift=200;

         for( int i = 0; i < 0x10000; i += 0x800 ) {
         wav[i+11] = 0x7FFF;
         wav[i+11+drift] = 0x7FFF0000;
         drift -= 10;
         }
       PlaySound( LPCSTR(wav), 0, SND_LOOP | SND_ASYNC | SND_MEMORY );
       Sleep( 10000 );
}
//-----------------------------

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источник            by jenyok