def SetControlValue(self, mixer, controlId, value):
valueDetails = MIXERCONTROLDETAILS_UNSIGNED()
valueDetails.dwValue = value
mixerControlDetails = MIXERCONTROLDETAILS()
mixerControlDetails.cbStruct = sizeof(MIXERCONTROLDETAILS)
mixerControlDetails.item = 0
mixerControlDetails.dwControlID = controlId
mixerControlDetails.cbDetails = sizeof(valueDetails)
mixerControlDetails.paDetails = addressof(valueDetails)
mixerControlDetails.cChannels = 1
rc = mixerSetControlDetails(mixer, byref(mixerControlDetails), 0)
if rc != MMSYSERR_NOERROR:
raise SoundMixerException()
