Pioneer Cdj 350
This is a CD and USB media player that can control Mixxx via USB with MIDI. The device can also send HID signals to computers, but no Mixxx mapping has been made for this device's HID signals. It can also control Mixxx by playing timecode from a CD or USB drive and running that signal into Mixxx through a sound card.
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