Clip Envelope/Specific Value

When applying a Clip Envelope, such as Gain, is it possible to arrive to an exact value? When I use mouse and push the bar up or down, the values don't shift by .1 db. Can I plug in my own value somewhere or press a key while using the mouse to arrive to more exacy values? Thank You.

I found something out. If I stretch the track vertically, so it's wider, then I can get more specific with the values. But no matter how much I try bringing down the gain, there's this one part that continues to register as 0.1db (a red flag). I even brought it down like 8db just to check out what would happen, and the output changed only .1 db minused. It's some loud clicking noise during a guitar part I played, like a string hitting a fret or something... not sure. But there always seems to be at least 1 little screwy thing in each recording I do. Pain! I'll have to eliminate it some other way I guess. Thanks.