Delay when editing audio clips' volume

Don’t know what category this falls under.

I am getting a terrible delay when I use the mouse to change the volume of a piece of audio. Doesn’t matter if I use the magic mouse, a Logitech trackball, an apple trackpad, the trackpad on my MacBook. There’s always a wait for the changes I made to actually happen. Once I’m locked on to that particular piece of audio, it will respond immediately as it should. but if I select another, I get that horrible delay.

I can use the little white square and that responds immediately. It’s just that I got used to simply clicking on audio and moving the wheel to change the volume. Did something change?

Does anybody know how to fix this? Thanks for any help!