Dolby Trailers, DTS Trailers and THX Trailers are all sections with downloads for testing surround sound systems receivers (they decode and encode the information for the speakers, acting as a processor for the audio), and are the most common types of audio systems and different formats like VOB, M2TS, MKV and WMV available in the WMV Trailers ... Surround Virtualizer: creates a surround sound experience. Audio Optimizer: gives you natural and louder, distortion-free sound. Dolby Digital Pass-Through: allows direct home theater connections for a full multichannel experience. Download the Dolby Audio API today and make your Kindle Fire game sound better than ever.