From other forums I get the impression that ducking doesn't work well in CEP/Audition (using the envelope follower). A bit of manual work with volume envelopes may be best. Or try db-Audioware compressor.
Somebody recommended ducking compression to me as a way to get a low drum and a bass working together so each gets heard. Volume envelopes is a *lot* of work to achieve that lol.
Im not sure how its done in CEP...But im sure if youve got a sidechain option itll work the same just about everywhere.
What you do is take a comp or a limiter and stickit on the track/s to be "ducked".
Then route (usually the vocal) the signal to be the "ducker" into the side chain of the compressor/limiter on the track that will be the "duckee" if you will.
At this point the vocal level will now trigger the compressor on the duckee track. Which will press the music down as the vocal floats over the top of it.
Yes that's it using the Envelope Follower in the multitrack view...I just did one and it was OK, maybe even pretty good but taks a bit of practice getting the settings correct.
Db-audioware dynamics processor is a bit easier but don't forget - if you LOCK the track that the source sidechain dynamics processor is on then you've just stopped the control signal from gettind to the receiving sidechain processors.
One additional thing I've noticed about side-chaining and ducking - IMO these days it may not be so much of a big deal to use that technique since you can squish things together to make them gel better using mastering compression and limiters so that, in effect, can duck things. I didn't say that's what I want or like - just the way it is, don't shoot me I'm just the messenger. This is what we've become - our ears have anyway in the pop commercial world