yur right that is a stupid question, u just left click anyway on the clip, then hold it and drag it over the selection u wanna change, depending what program your using calls it, u just wanna fuck wit the amplitude of the selection, so like in adobe auditio ud click amplify and u could make it louder lower or dead silent
Check to make sure that the snap to grid is turned off:
I don't think you can do that in Sonar, I've never seen that. I think what you'll need to do is just select the clip and create Splits. Just click S on your keyboard for your start and end points. Then it will be its own clip. If all you're trying to do is add an envelope to your clip then simply choose the Envelope tool at the top and you can draw your envelopes in the clip.