typedef struct tMIXERCONTROLDETAILS { DWORD cbStruct; DWORD dwControlID; DWORD cChannels; union { HWND hwndOwner; DWORD cMultipleItems; }; DWORD cbDetails; LPVOID paDetails; } MIXERCONTROLDETAILS, *PMIXERCONTROLDETAILS, FAR *LPMIXERCONTROLDETAILS;