1D drivers are currently available for Windows XP 32bit, XP 64bit, Vista 32 Bit, Windows 7 32bit, Windows 7 64bit and OSX 10.5.8 to 10.7 (Lion).
To install 2 x XONE:1Ds on a Windows-based operating system:
Download the latest driver from the link above and run the installer, connect both XONE:1Ds when prompted on-screen, once driver installation is completed there will be 2 instances of the XONE MIDI device in the Sounds, Video and Game Controllers section of the Windows Device Manager, this indicates the installation has completed successfully.
To install 2 XONE:1Ds on an OSX based operating system (10.5.8 or above):
Download the latest driver and connect both Xone:1Ds, run the installer, when this has finished, restart OSX then once restarted, check the OSX MIDI device window to ensure 2 instances of the Xone MIDI Device (direct) icon are present and not greyed out, this indicates the installation was successful.
With both installed you can now map them in Traktor making sure to set both XONE devices to transmit MIDI on different channels.
The default is channel 16, please see page 13 of the 1D user guide describing how to change the midi channel of the second 1D to channel 15.
To be able to Map both the 1D devices in Traktor Controller manager, add a new Generic MIDI device and assign the In-Port and Out-Port to the Xone MIDI Device, there will be another instance titled Xone MIDI Device (2), leave this for the moment.
Map the controls as desired, e.g. the 1st Xone:1D configured to control decks A and C, Once the 1st Xone:1D is mapped you can copy these settings for the second Xone:1D so it controls Decks B and D instead of Decks A and C, to do this, click edit then duplicate to create a second Generic MIDI device, this is exactly the same as the 1st device so it needs to be assigned to the 2nd Xone:1D by changing the In-Port and Out-Port to the Xone MIDI device (2).
Next click edit, at the bottom of the drop-down menu there will be an option titled AB > BD, click and now the second Xone:1D works in the same manner as the 1st.