🚀 go-pugleaf

This one has me stumped:
I wrote a stupid little program.  There is one form, two edit boxes, and a
MouseOver event handler.  In the handler is the code:

void __fastcall TForm1::FormMouseMove(TObject *Sender, TShiftState Shift,
      int X, int Y)
{
        EditX->Text = "       " + X;
        EditY->Text = "       " + Y;
        // Jungle Sounds
        if (X == 10) PlaySound("c:\\windows\\media\\jungle asterisk.wav",
"", SND_ASYNC);
        if (X == 20) PlaySound("c:\\windows\\media\\jungle close.wav", "",
SND_ASYNC);
        if (X == 30) PlaySound("c:\\windows\\media\\jungle critical
stop.wav", "", SND_ASYNC);
        // and so on
        // Musica Sounds
        if (Y == 10) PlaySound("c:\\windows\\media\\musica asterisk.wav",
"", SND_ASYNC);
        if (Y == 20) PlaySound("c:\\windows\\media\\musica close.wav", "",
SND_ASYNC);
        if (Y == 30) PlaySound("c:\\windows\\media\\musica critical
stop.wav", "", SND_ASYNC);
        if (Y == 40) PlaySound("c:\\windows\\media\\musica default.wav", "",
SND_ASYNC);
        // and so with Utopia and Robotz on up to 370 for all 68 Media
sounds
        // and the window is at least 400 by 400 in size.
}

So, OK, this is supposed to operate like a harp with strings in the
horizontal and vertical directions that are each attached to a sound and are
plucked when the cursor passes over them.  And the sounds work OK.

What is puzzling is what appears in the EditX and EditY boxes.  I was hoping
that the X and Y coordinates would appear.  NOPE!
As you move the cursor in the X direction, what scrolls through the Edit Box
are the names of the paths to the first 9 jungle sounds.
As you move the cursor in the Y direction, what scrolls through the Edit Box
are the names of the paths to the first 11 jungle sounds.
And I do mean "scroll" as in an LED message board.

Can anyone tell me what is going on here?  I am mystified.

Thanks,
Nick