My band is covering "On the Dark Side" by JC&B3. At the end of the solo, Michael Antunes does a "high E shake", progressing through A, B, B#. Apparently, the right hand side keys are used for this. When I use the top side key (curved), I get a lot of squeaking. Using the middle key makes it sound flat. The part of the solo I'm talking about is at 2:01 of this video: youtube.com/watch?v=GgIsyoxZ7Uw&list=RDGgIsyoxZ7Uw&start_radio=1. Can anyone figure out what side key(s) are used for this?