Just set mine up, turned on what I thought was the On button (says on/off) and it makes a lawnmower type sound and the odd bubble sort of pops up like an underwater fart but nothing else. I looked at the instructions and it calld the on/off bit the control panel (?) and says this big gel pad is the on/off button, I have pressed and pressed it but it's just a big gel pad. Does anyone have one and know how the silly thing works? Thankyou