Sure. What kind of system do you have? Windows or Mac?
The basics are. Install all drivers for the DJM2000 and Firmware.
Open up ableton.
Go to Options.
Select Audio Tab.
On Audio Device. ASIO
Device Type. DJM2000 should be on the list.
Make sure you disable Mono Channels and use Stereo Channels.
Create 2 new channels and Map the audio routing.
So they should like like this. In Ableton Mix View.
Audio 1 = Ext In 1/2 then Ext Out 1/2 then Arm Track Leave Auto Alone
Audio 2 = Ext In 3/4 then Ext Out 3/4 then Arm Track Leave Auto Alone
Audio 3 = Ext In 5/6 then Ext Out 5/6 then Arm Track Leave Auto Alone
Audio 4 = Ext In 7/8 then Ext Out 7/8 then Arm Track Leave Auto Alone
Your all done. YOu can now use all 4 channels on your DJM2000 for Mixing. You can turn on Midi and Map the DJM2000 to Ableton controls too.