This is a realtime AC3 encoder. It encodes to AC3 what you send it by using ASIO. ASIO is used to transfer audio from the sound card to the cpu. The cpu encodes the sound to AC3 and send it out of the computer by using the sound card digital passthru. You can easily do this to every sound played in windows with this program. The only inconvenient is the latency (around 180ms with WaveOut, maybe less). For those using the kX drivers : In the DSP, connect the first 6 pins of Surrounder+ to the pins asio0 to asio5 on epilog and activate passthru in the mixer (check 'Digital Output Only' and select "SPDIF 0" for 'Toggle AC-3 Passthru mode'). Then double-click redocneXk.exe. Below are some pics to help set the Mixer, the DSP, the Surrounder+ and the ASIO Control Panel. This is provided to help the users that never touched ASIO or the DSP. Other settings can be used. Mixer DSP Surrounder+ ASIO Control Panel It is possible to make it work with the Creative drivers. I have included a default preset for the Creative drivers. Version 2.05 is the latest version. The versions 2.XX of redocneXk that contain a GUI never worked correctly. It causes stutter no matter what you do. It's not recommended to use it. It is only provided to show what a version with a GUI would look like and what it could do. I don't plan on working on it again. I've lost interest, I no longer use a supported soundcard and I don't have the free time to work on it anymore. Sorry about that. The versions 1.XX should work in most cases. Link : Go here to get redocneXk Hosting nicely provided by radiocolonel.it Screenshot : redocneXk_v2.02.png Please report any bugs. I'm interested in knowing how well it works for others. I'm open to suggestions on improvements.