You have your lead sound.
Use an aux send to send to the reverb.
Now your lead sound has reverb.
Open the channel edit window for the reverb effect and engage the standard compressor
in the channel strip. Engage the little “SC” button on the compressor.
Now back to your lead channel, use another aux send and send this one to the side-chain
of the reverb channel’s compressor.
Sometimes you have to scroll down, the side-chain inputs are at the bottom.