An amplifier biasing stage includes a transistor that provides a biasing signal for a complementary pair of field-effect transistors included in an output stage of an amplifier. The resection guide is operable to be secured to a bone. If the first route is the host route, suppressing includes not originating an LSA for the first route. The AGC controller is further arranged for evaluating a signal strength of the input signal and generating the control signal dependent on the signal strength of said input signal. The subsidiary data is provided synchronous to the primary content data.