Techniques and interface controls are described which allow users of signal editing applications to easily select previously-selected segments of the signal. The suction surface and the pressure surface both extend axially between a leading edge and a trailing edge, as well as radially from a root section to a tip section. The plurality of controllable current sources may include a first and a second controllable current source. Multidimensional motion of a bicycle component mount may include rotational, translational, and rototranslational motion with progressive elastomeric resistance in multiple directions.