The present invention deals with the composition, and application of novel phosphate polymers. The snubber circuit also comprises a second energy storage device coupled to the first energy storage device to store the captured energy. The ion focusing apparatus is configured so that an ion beam enters the housing via the ion entrance and is collisionally focused by the multipole ion guide and neutral gas prior to exiting the housing. The frame is also adapted to conform to the slope of the ground in which the pole is embedded. This provides shorter processing time needed for switching among tone colors of different play styles, and also the work of editing the performance data or the like including the switching of the tone colors can be performed easily and accurately.