That's exactly what I'm doing...but the purple wave forms are not disappearing like it shows in your photo when I do it. Am I not dragging the right thing? I get the up and down straight line... but at no point does anything really change.

Also, OMG thank you for trying to help. Sorry, I am totally insane at this point over this.

OH OH OH! I think I got it!! You can't have the 'control volume' thing on at the same time!! EEEEE.

Thank you again. \0/