Embodiments of the present invention provide a method, system and computer program product for cash management optimization method for payment processing. In particular, the method attenuates the noise propagating between a noise source and a reference point in the flow stream. The at least one first fixation blade partially extends around an outer surface of a first of the pair of side walls and is positionable between a first configuration for insertion into a disk space between two vertebrae and a second configuration for attachment to a first of the vertebrae. For example, a speaker may be included in the keypad module.