Here what you may looking for :  #include <Constants.au3> Opt("MustDeclareVars", 1) Global Enum $eRender, $eCapture, $eAll Global Const $DEVICE_STATEMASK_ALL = 0x0F Global Const $STGM_READ = 0 Global Const $CLSCTX_INPROC_SERVER = 0x01 Global Const $PKEY_AUDIO_ENDPOINT_SUPPORTS_EVENT_DRIVEN_MODE = "{1DA5D803-D492-4EDD-8C23-E0C0FFEE7F0E}" Global Const $PKEY_DEVICE_INTERFACE_FRIENDLY_NAME = "{026E516E-B814-414B-83CD-856D6FEF4822},