Shakey's Shuffle

Hi David...I have a question about chorus #8 in Shakey's Shuffle.  When I listen to the chording going on in the first four bars, it sounds like you are using your hands\cup to contribute to the effect, kind of in a wha wha type of sound.  Sounds like you may be opening your cup on every other triplet.  In the video instruction, you do not mention this.  Am I hearing what I think I am hearing?

Homer.