Transition Audio Volume

I'm trying out Adobe Rush as a replacement for iMovie and Camtasia. We do some audio / music to help transition into and out of content, and I'm used to be able to control audio volume within a clip - adding points where the volume starts to decrease to nothing.

The only thing I can imagine doing in Rush is to cut the audio and change the volume of the two new clips, but it will be a pretty dramatic cut from one volume to the other. Is there any way to transition audio volume down and up?