A charge-and-add DC-DC voltage converter design using a switch network that toggles between two states, either simultaneously charging a flying capacitor or creating a DC voltage on the output capacitor by connecting all flaying capacitors in series thus adding the input voltage to remaining voltages on flying capacitors after they were charged. The panel fastener is constructed and arranged to be preassembled with an attachment structure extending from an undersurface of the primary panel. The audio manager combines the user music profile from each user to form a group music profile. The gain stage, which has an associated impedance, has an input that is connected to the interconnect. The scaling signal is coupled to the original control signal by a coupling mechanism, thereby enabling the modification of the original control signal by the scaling signal forming the effective control signal. The metallization region is formed of a first layer of titanium and a second layer of niobium.