Methods and apparatus are provided for electronically trapping a selected digital color image pixel. The power amplifier has an input stage and a current mirror stage and incorporates a control transistor between these stages. The sender also enters the recipient’s telephone number. The method further includes receiving a second control signal from the fluid additive injection system when the fluid additive quantity for the zone has been injected into the fluid dispensation system, and deactivating the fluid additive dispensation system in response to the second control signal.