I found this for ableton
http://sonictransfer.com/side-chain-compression-tutorial.shtml
which Im going to do alongside Bristols explanation (which I hope he doesnt mind me posting)
"Duplicate the bass track.
Make two tracks of kick only
Make 3 busses
Route L channel (Hard pan left)only of bass track 1 to Bus 1
Route R channel (hard pan right) of Kick track 1 to Bus 1
Route R channel only (Hard pan Right) of Bass track 2 to Bus 2
Route L channel (Hard Pan Left) of Kick track 1 to Bus 2
Put a C1 compressor/side chainable compressor on busses 1 and 2
On bus 1 the compressor sidechain function is set so that the R channel (Kick) causes the compressor to engage but compression happens to the L Channel (Bass). The plug in only out puts the compressed signal by default in side chain mode, in this case L CHannel of the bass that is now ducking each time the kick hits. the Kick input is silently feeding the compressor
On bus 2 the compressor sidechain function is set so that the L channel (Kick) causes the compressor to engage but compression happens to the R Channel (Bass). The plug in only out puts the compressed signal by default in side chain mode, in this case R Channel of the bass that is now ducking each time the kick hits. the Kick input is silently feeding the compressor
I now have two Mono hard panned left and right Bass channels that are ducking in time with the Kick hits. so I rout busses 1 and 2 to a third bus which means I now have a single stereo bus that controls the ducked/Sidechained bass that I can add EQ Reverb or whatever."
I think between them Ill get this sussed over the weekend