I’ve got a Numark Mixtrack Pro, which I’ve used for DJing for a while with Traktor Pro, and I’ve recently got hold of a nice new Akai APC 40 which I use with Ableton Live. I’m running Windows 7.
I want to be able to use my Mixtrack to control Traktor while using the APC40 with Ableton, however every time I try booting them both up, Ableton takes control and the Mixtrack stops sending signals to Traktor.
Go into Preferences in Ableton, select the MIDI/Sync tab. Turn off your Mixtrack pro under all 3 sections, Track, Sync, Remote, as well as Input AND Output under MIDI Ports.