Copying the waveform of an audio file to another??

yom62111662  wrote I think this might be a challenge.

It might well be - you can't invert the drive signal to the side-chain input to the Dynamics Processor, which is what you'd need to be able to do to achieve this. Perversely, you might be better off trying to do this in Audition 3 using the Vocoder, which disappeared after that release - not in the least because it was a bit of a pain to set up, and you needed consistent signals to get it to work well. Even then, it's a vocoder - so it might not produce exactly the effect you're looking for anyway.

Invariably, the best way to do anything like this is to use a volume envelope on the effect, and set it up manually - it will always sound better if you do this, rather than relying on any form of automation.

Well you could copy and Mix Paste the effects track over your speech in the Waveform view but the proper way to do it is to use a Multitrack session with your speech on one track and effects on a second one. You can then use the Volume envelope on the effects track by manually placing keyframes to fade the effects in and out.

It can be done automatically using Sidechaining in Audition where one track is used to control the volume of the other but it is quite complicated to set up if you have never done it before.