I have what should be a simple problem but haven't been able to find a
solution.
I am using DirectX 9 to play a simple 16 bit mono sound file in a Sound card
modem application. The playback code is simple:
devSelectedPlaybackDevice.SetCooperativeLevel(Me.Handle,
CooperativeLevel.Priority)
bufPlayback = New SecondaryBuffer(Filename,
devSelectedPlaybackDevice)
bufPlayback.Volume = -5000 + 50 * intOutputLevel ' -5000=off,
0=full volume
bufPlayback.Play(0, BufferPlayFlags.Default)

All this works fine IF the application window is the active window. If the
application
Window is not the active window the sound card capture code (not shown)
continues to work fine but there is no playback from the sound card output.
This works the same way on several different sound cards (internal or
external USB). There is no exception thrown just no output from the sound
card. Once the window containing the application is made active again it
plays correctly.

How can I make it play regardless of the applications's window status
(active, non active, minimized)?

Thanks,
Rick Muething