DirectSound, IDirectSoundCaptureBuffer_Start, IDirectSoundBuffer_Play and "Listen to device"

Hi, I wrote a library for voice over ip application. Its work very fine.
I tested the library with a lots of combination of soundcard / headphone. Now I have a problem with Windows7 and some USB headphone with incorporated soundcard.
I initialize the capture device (IDirectSoundCaptureBuffer_Start) then I inizialize the play buffer (IDirectSoundBuffer_Play) all is working. But with some type of USB headphone, just after call IDirectSoundBuffer_Play(), I'm start to listen what my microphe
caputure directly on my headphone (with a low level of intensity) when I close my application the effect disappears. If I use the option (on Microphone Propreties dialog) "Listen to this device" I have a different behavior the level it's more hight
and there is a few delay between what I say and what I hear. With my application the effect are similar but there is no delay (or insignificant) and the hear level is considerably more low.
So I have no idea.
Any help?

Using a headset needs several steps even needed if you have the latest computer or Mac OS X release. Please make sure to follow them in order.
Download the Apple Bluetooth Firmware Updater
Install it
Remove as much USB devices from your computer as possible
Launch it from Applications > Utilities > Bluetooth Updater
Apply it to your adapter (takes very long and disconnects your Bluetooth mouse).
Start the Apple Bluetooth Assistant and select Headset. Do not use anything else!
Make your headset Bluetooth visible. Look up the manual of your headset how to do that.
Now select the headset in System Preferences > Sound.
In most cases step 3 is missed. You have to start the already installed updater yourself (do not ask me why).

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DirectSound, IDirectSoundCaptureBuffer_Start, IDirectSoundBuffer_Play and "Listen to device"

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