Timecode vinyl control links
http://mspinky.com/Some_Technical_Info_on_VInyl.pdf
http://www.mspinky.com/SoftwareSpec_0.0.6.pdf
https://www.youtube.com/watch?v=5BkCtCnHqIE
https://www.youtube.com/watch?v=zLB9Y_xTV24
https://github.com/Holzhaus/vinylla
https://youtube.com/watch?v=sKUhFpVxNWc?t=15m45s
https://github.com/jrosener/digitalscratch -- no position detection
https://en.wikipedia.org/wiki/Final_Scratch#Vinyl/CD_time_code
https://sourceforge.net/projects/scratchlib/
https://serato.com/controlcd/downloads?manualsanddownloads#manuals-and-downloads
This is the Mixxx Wiki - 
Mixxx is a free and open-source DJ software.
Manual
Hardware Compatibility
Reporting Bugs
Getting Involved
Contribution Guidelines
Coding Guidelines
Using Git
Developer Guide
Creating Skins
Contributing Mappings
Mixxx Controls
MIDI Scripting
Components JS
HID Scripting