A system for presenting an electronic programming guide in a media system is disclosed. One embodiment utilizes an accelerometer-based detector that presents a light load to the chest, is sensitive to the desired high frequency range, and provides a quantitative measurement of the quality of the acquired signal. The first and second slider arrangements are coupled by a common strap having first and second ends. The balancing transformer configuration techniques permit a relatively small number of power inverters, such as one power inverter, to power multiple lamps in parallel. The playback manager stores the data events in the hierarchical data structure based on type of data event and based on timestamps associated with each respective data event.