You have a lot options. I assume you are using the reverb as a send effect. You can automate the send level, to be high at the start, and lower at the end. You can automate the reverb plugin paramters to be bigger at the start, and lower at the end. You can have two different Buses set up with different reverbs, 1 large , 1 small. You can automate the track to send level to the large reverb. When you want the other reverb to take effect, increase the send to the 2nd reverb while decreasing the send level of the 1st reverb. As you can see the common theme is automation. Perhaps you should reserach this if you are looking to improve your logic skills. ( hint, in the view menu of arrange select "track automation" ). Take care, Jeff