Improved approaches to flexibly implementing graphic equalizers on media players are disclosed. The seat bottom can have a rigid seat pan that underlies a flexible seat insert and a seat cushion. The reflected measurement beam is split and its parts are differently polarized. A memory region on one of the compute nodes is used as a window into a memory region in another compute node. A planar optical waveguide assembly prepared according to the method of the invention. Exemplary identifiers may be a MAC address andor an IP address.