Hi, I've benn using an external volume control for my ADI-2, but now I wanted to change to the built-in one, I've seen in the manual you have to open the unit and just change a jumper..the problem comes when I try to open the unit.. I take off all the screws but the lid doesn't seem to come off that easy, I dont wanna force it, I'm afraid i'll brake something.

any help? am I missing anything?

thanks