HI im looking for a quiet air pump , i have bought two pumps that claimed to be silent but no such luck , my current pump is a profile 1500 . I had someone tell me that if you bleed some of the air out with a valve that it takes some of the strain out of the pump making it quieter .Well i have the valve in the air tube and i am bleeding some of the air out of the line , but its still to noisy. Are there any silent pumps out there ? Please give me make and model#. Txs