Winmm really really urgent

Well i wrote a program which was usin intensively sounds (through a mm control) and i notice that after a day even my pIV gets slown, I guessed it was a leak in memory by the microsoft designed control, so i rewrote it with the sound API (
Private Declare Function mciSendString Lib "winmm.dll" Alias _
"mciSendStringA" (ByVal lpstrCommand As String, _
ByVal lpstrReturnString As String, _
ByVal uReturnLength As Long, ByVal hwndCallback As Long) As Long
and so on... u know the rest... well a simple loop playing varioous short sounds continiously...). Same problem after a day the memory get filled!!! So, I beg ur help that really important please tell me how to play sounds during a long time without filling unrelentlessly my disk buffer or my RAM or whatever it is.... thx by advance!!!

Are you closing the device that you had opened once you are through playing a file? I think this might be the problem as every open file would be taking its ow memory.