SURF
The large pneumatic exhausts slowly through the magnet and pulls the spring
pallet away from the triangular slot and allows air to blow, through the slot on the
front of the box, onto the edge of the metal sheet.
The screw next to the magnet intrudes into the airway that connects the pneumatic to the magnet. It is used
to adjust the air flow rate and thus the rate at which the effect builds and dies.
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