Dolby Advanced Audio v2 offers Surround Virtualizer (for built-in speakers), Volume Leveler Volume Maximizer Graphic Equalizer Audio Optimizer Audio Regulator: http://www.ubergizmo.com/2011/01/dolby-latest-surround-sound-technology-for-pcs/

Dolby Headphone

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Dolby Headphone logo

Dolby Headphone is a technology developed by Lake Technology (Australia), that later sold marketing rights to Dolby Laboratories, sometimes referred to as Mobile Surround, which creates a virtual surround sound environment in real-time using any set of two channel stereo headphones. It takes as input either a 5.1 channel signal, a Dolby Pro Logic II encoded 2 channel signal (from which 5 channels can be derived) or a stereo 2 channel signal. It sends as output a 2 channel stereo signal that includes audio cues intended to place the input channels in a simulated virtual soundstage.
Dolby Headphone is incorporated into the audio decoders packaged with surround headphones including:

Astro Gaming A40 System
Astro Gaming A50 System
Logitech G35
Plantronics Gamecom 777 Headset
Plantronics Gamecom 780 Headset
Turtle Beach Systems Ear Force X41
Xbox Live Gaming Headset
Tritton Technologies AX720 Gaming Headset
Corsair HS1 USB Gaming Headset
Sennheiser PC 163D and PC 333D

Dolby Headphone is supported by various netbooks, including the Lenovo IdeaPad S10-2 and the Acer Aspire One. Asus Xonar soundcards also have Dolby Headphone support, including Asus Xonar models: D1, D2/PM, DX, D2X, DG, HDAV1, ST, STX, and Xense. PowerDVD Ultra 9 also supports Dolby Headphone when certain options are set in the "Settings" menu but PowerDVD is not marketed as an official product of Dolby Headphone.
Several Nokia smartphones (Nokia N8, Nokia N9) officially support Dolby Headphone, and the technology is also supported in the new version of the Nokia Belle Feature Pack 1. The functionality is either pre-installed or is available as an update for the Nokia 603, 700, 701 and 808 Pureview, and is included on many models in the Lumia series including the 810, 820 and 920. ^[1]^[2]

Technology

Head-related transfer functions (HRTFs) are used to generate positional audio cues in the two channel output signal. A finite impulse response (FIR) filter is used to process the audio with lower latency.