Wikipedia
Xwax
xwax is an open source vinyl emulation software. It was initially developed in 2006 as proprietary software. In May 2007 xwax was licensed under the GNU General Public License, making it the first open source software of this kind.
Unlike the software supplied with some proprietary packages for vinyl emulation, xwax is hardware independent. Notably, it can be used with the audio device and timecode recordings supplied with the Scratch Live program, and older versions of the Traktor Scratch program, and the audio interface supplied with the original Final Scratch.
The xwax source code is used to decode timecodes for vinyl control in Mixxx.