ActivateAudioInterfaceAsync Win32 API

Anyone got any experience with the ActivateAudioInterfaceAsync Win32 API ? It looks good, but wants things I don’t understand, like “process IDs”

They are displayed in the details view of task manager. They identifiy a running process.

Thanks. Elvind, but at that stage I was trying to get them programatically, However, the JalAudio stuff gave me what I needed (and near blew my mind in the process - WOW!). Hence my latest offering of SoundToLights.