I can tell you are in for a delightful week.
You will get the feel of the bellows change, think of it like pharsing, or the Omph to the Pa.
While seated, for a "vox humana," "tremelo," "vibrato" (whatever you choose to call it) begin a "sewing-machine-knee" (toe on floor heel-jiggling) with the leg it is resting on.
HAVE FUN!
Sincerely,
Gargoyle
I'm going to take mine out and give it a squeeze tonight....its been a long time.