Hi all. I have an audio driver (port driver is portcls.sys), with 3 wave subdevices. I want the user to be able to use sndvol32 to regulate the wave, CD and SYNTH playback volumes for each wave subdevice. So the topology miniport has to reflect this, and be properly connected to the wave subdevices. With WinXP, I have found at least 2 successful ways of doing this: a) I create 3 topology miniports, and connect them to their corresponding wave miniports via PcRegisterPhysicalConnection. The topology miniports are the same, and quite simple; in fact for now they just have a wave volume and mute nodes declared. There are two pins to each topology miniport, with the first pin connected to the output of its WAVE subdevice (its category is KSCATEGORY_AUDIO), and the second serving as the output (its category is KSNODETYPE_SPEAKER). This method also works with Win2k. b) I create 1 topology miniport, with 3 input pins. Each input pin is connected to its corresponding WAVE subdevice via PcRegisterPhysicalConnection. All these pins feed into a sum node, which then feeds into the wave volume and then the wave mute. Finally, the wave mute is connected to the output pin, which is of category KSNODETYPE_SPEAKER. Both these methods work fine under WinXP (method a is confirmed to work with Win2k), except in the second method I have an extra volume displayed, probably due to my sum node. I can regulate the volumes for each wave subdevice as expected. However, under Win98SE/ME, these methods do not work at all. While the volumes for the first wave subdevice are displayed OK in sndvol32, using them has no effect. Worse, there are no other subevices in the playback menu of sndvol32; the volumes for the last 2 subdevices cannot be displayed at all. NewStream is not even called when I try and use the MS supplied synth and my wave subdevice. When I tried a variant of method a), I had some success in 98SE/ME. The variation was to create and connect only 1 subdevice-topology pair at once. Creating and connecting more than 1 pair results in the same symptoms as I've described above. It therefore seems to me that my property handlers are functioning OK. Could anyone give me some clue about what I am doing incorrectly? In the past I have always had to deal with 1 wave subdevice, which never have me any problems with the topology. Thanks. Philip Lukidis ****************** 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/