I understand from the Windows DDK documentation that SysAudio builds filter graphs from the available KSCATEGORY_AUDIO filter factories into a "Virtual Audio Device", which is registered as a KSCATEGORY_AUDIO_DEVICE. My question is that each individual KSCATEGORY_AUDIO filter factory contains various nodes, each of which has a node ID consisting of a numeric index based from zero. When all the necessary filter factories are linked to produce the "Virtual Audio Device" it is clearly necessary to re-index many of the nodes' IDs because it is not sensible to have multiple nodes with the same ID. I have observed this behaviour using KsStudio. However, I have not been able to deduce the logic used in this re-indexing process. I would also like to know how I can obtain the mappings between the node ID given to a node in the "Virtual Audio Device" and the corresponding nodes' ID in it's own filter factory. I hope that the above makes sense. I would be very grateful for any assistance with this matter. Thanks Pete ****************** 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.de/