Thanks! I'll do a search through the archives and get this into my product *.inf. -----Original Message----- From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Jeff Pages Sent: Monday, October 01, 2007 7:05 PM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re: USB audio changes in Vista? Jerry wrote: > Now that I understand what's going on, Can I change my USB descriptor or > my > .inf to get the OS to choose a stereo 24bit 48K as the default inputs for > my > device??? You can set the default format for your device in your INF file as follows: In the AddReg statement for your topology port, add an OEMSettingsOverride.AddReg, eg. [Auricon.Interface.Topology1] AddReg=Auricon.I.Topo1.AddReg, OEMSettingsOverride.AddReg Then define OEMSettingsOverride.AddReg as follows: ;; Set default format to 48kHz, 24-bit, Stereo [OEMSettingsOverride.AddReg] HKR,"EP\\0", %PKEY_AudioEndpoint_Association%,,%KSNODETYPE_LINE_CONNECTOR% HKR,"EP\\0", %PKEY_AudioEngine_OEMFormat%, %REG_BINARY%, 41,00,8C,70,28,00,00,00,FE,FF,02,00,80,BB,00,00,00,DC,05,00,08,00,20,00,16,0 0,18,00,03,00,00,00,01,00,00,00,00,00,10,00,80,00,00,AA,00,38,9B,71 The PKEY_AudioEngine_OEMFormat structure is defined as: { VARTYPE VT_BLOB; //0x0041 short Padding; // Don't care ULONG ByteCountOfWhatFollows; // 0x00000028 WAVEFORMATEXTENSIBLE Format; } Finally, you need to define the GUIDs in your [Strings] section: PKEY_AudioEndpoint_Association = "{1DA5D803-D492-4EDD-8C23-E0C0FFEE7F0E},2" PKEY_AudioEngine_OEMFormat = "{E4870E26-3CC5-4CD2-BA46-CA0A9A70ED04},3" There was some discussion of this here late last year if I recall, if you want to delve back through the archives. Jeff ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/ ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/