This paper introduces behavioral model of advanced type of current conveyor with extended controllable inter-terminal features. This type of active device offers three independent current input terminals (X), all with adjustable input resistance R-X where currents from all X terminals are weighted in independent branches by electronically adjustable current gains (B) and summed in the output node. Voltage inter terminal relations are advanced because of controllable voltage difference of two pairs of input voltages. This advanced active device offers interesting features for future applications in analog signal processing. The functionality of the model was verified by PSpice simulations.