I'd like to buy a second hand controller for traktor pro 4. what devices is fully compatible ? is there any of them not working cause too old or not updated ?
thx a lot.
There are a few cases of people reporting the very old x1 mk1 does not work. Else every traktor or midi controller should work with traktor.
If you buy one from native instruments it should be plug and play.
I've the DDJ-T1 and it works very weel with Traktor pro 4
You've provided no details of your computer or operating system, and it's the OS and driver availability which is more likely to cause issues rather than Traktor, as it should work with any MIDI controller.
There's a list of controllers on the main site, with downloadable mapping, if you go with a non NI unit.