A system for controlling the delivery of notifications. The method selects a path if an estimate of the relative contribution of the current path to the output signal-to-noise ratio of the receiver exceeds a given threshold. A user can navigate the various options to control devices that are separate from the display device. Both single damper mass and double damper mass configurations are shown. The coupler assembly has at least one fluid inlet for introducing andor withdrawing a fluid from one or more of the chambers. The air line is structured to determine the depth at which the submersible pump cable lies beneath a liquid.