The present invention relates to an enzyme electrode including: a carbon particle; a metal particle held on the carbon particle, the metal particle having a catalytic activity against a redox reaction; a redox enzyme. The system enables the combination of these tunable signals to form an output signal that is tunable over a combined band including these individual spectral bands of the separate semiconductor sources. Notification is received at a voice platform that the potential customer has answered the telephone call. An extruded pin retainer is provided that is positioned on a proximal end of the chute for enabling attachment of the chute to a cement truck or to the distal end of an adjacent chute during use in dispensing concrete from the truck. The device’s fixture parts are three or more so that two or more workpieces are fixed simultaneously in the device. In one implementation, such a content based partitioning system includes a system processor, a system memory, and a content based partitioning module stored in the system memory.