A real-time music request system is provided for use with editing tools for the editing of video productions. The archwire, in an as-manufactured condition, has a portion of substantial arcuate extent, which is canted relative to the occlusal plane. The drive train may include a coupling to the housing and, in an embodiment, the coupling may comprise a ratchet coupling. The reactants may be hydrophobic or hydrophilic and present as fluids, solids or combinations of solid and fluids. The locking pin is biased toward engagement with the locking detent such that when the lever is pivoted to the locked position, the locking detent aligns with the locking pin permitting the second end to engage the locking detent.