If in yer list of plug-ins there is one that shows called C1 insert... or something then there is a solution... SOrry m8s but I got a new laptop and I'm half way (wishfull thinking) thru installing and config, so I can say 4 sure 'till then, as I haven't installed the waves plugs...
Db AudioWare Dynamics Processor!
Also this seems 2 have the necessary features so it is a quick way 2 start (thankz 2 Mark's tip .. Nice 1 m8 :) )!!
Here is how U go about it..
".....
Side-chains for ducking
Say you have a stereo soundtrack on channels 1/2, and the narration (voice) on channel 3:
Open a first dB-D insert effect on channel 3
Set the Send button to A
Open a second dB-D insert effect on channels 1/2
Setup as a 3:1 ratio compressor, threshold -30dB, gain 0dB
Set the Recv button to A
and that's it! Channel 3 is now controlling the dB-D on channels 1/2.
.................."