Private Declare Function waveOutSetVolume Lib "Winmm" (ByVal wDeviceID As Integer, ByVal dwVolume As Long) As Integer
Private Declare Function waveOutGetVolume Lib "Winmm" (ByVal wDeviceID As Integer, dwVolume As Long) As Integer
Private Sub Command1_Click()
Dim a, i As Long
Dim tmp As String
a = waveOutGetVolume(0, i)
tmp = "&h" & Right(Hex$(i), 4)
Text1 = CLng(tmp)
End Sub
Private Sub Command2_Click()
Dim a, i As Long
Dim tmp, vol As String
vol = Text1
tmp = Right((Hex$(vol + 65536)), 4)
vol = CLng("&H" & tmp & tmp)
a = waveOutSetVolume(0, vol)
End Sub
给你代码 自己摸索吧