From the FxSound Audio Enhancer device point of view, the driver keeps the device always in D0 state. The device does not support run time power management or PoFx which is introduced in Windows 8. But since this is a virtual audio device, it does not consume any resources when audio is not in use. Only when audio is streamed, the device buffer is filled which is read and processed by the application.
In FxSound application, during standby, audio devices are not released by the application which could have been reported as audio service being used by FxSound.
Unfortunately I don’t have any workaround to suggest, to fix this when the application is active. I can check further if the driver and application is causing any battery drainage when idle.
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