Universal preamplifier card to insert into the PM main frame. Programmable input sensitivity (MICRO, AUX AUX H and L). It has bass and treble controls, with removable buttons. Audio signal can be assigned to program output or to priority output from PM preamplifier. It includes an independent output which allows addressing the audio signal to another preamplifier or power unit. Frontal LED to indicate priority control activation. RJ45 inputs / output connectors.