Ya puestos posteo lo que encontre.
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
Public Function PlayMidiFile(MidiFile As String) As Boolean
'MidiFile = File's Full Path
'Returns: True if successful, false otherwise
Dim lRet As Long
On Error Resume Next
If Dir(MidiFile) = "" Then Exit Function
'Stop any currently playing .mid
lRet = mciSendString("stop midi", "", 0, 0)
lRet = mciSendString("close midi", "", 0, 0)
'Play
lRet = mciSendString("open sequencer!" & MidiFile & " alias midi", "", 0, 0)
lRet = mciSendString("play midi", "", 0, 0)
PlayMidiFile = (lRet = 0)
End Function
Public Function StopMidi() As Boolean
'Stops midi from playing
'Returns: True if successful, false otherwise
Dim lRet As Long
On Error Resume Next
'Stop any currently playing .midi
lRet = mciSendString("stop midi", "", 0, 0)
StopMidi = (lRet = 0)
lRet = mciSendString("close midi", "", 0, 0)
End Function