Hi , I do have a hardware capable of dolby prologic decoding. (1) How do I control this functionality from user mode ??? I described my STATUS below. Everything i want to do is enable and disable my hardware supported DPL. I already tried via BASSBOOST and that worked fine. STATUS: I'm listed in KSStudio as KSCATEGORY_AUDIO and KSCATEGORY_CAPTURE. I do have KSPROPSETID_TopologyNode on the 'Misc.Supported PropertySets' and a KSNODETYPE_PROLOGIC_DECODER (enable,disable,channel-config) in place. When i 'refresh' the (outlined) KSPROPERTY_TOPOLOGYNODE_ENABLE my Get function is called. Thanks a lot Micha ****************** 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/