Abstract: A capacitive touch detection system, which can be used to inhibit motorized faders in an audio mixing system, includes touch detection circuits each having a respective conductive area for touch determination by detection of increased capacitance at the conductive area. The touch detection circuits are operable during predetermined active periods initiated by a clock generator which activates a pulse generator to produce an enable pulse EP1 for one detection circuit. The trailing edge of that enable pulse EP1 generates a non-overlapping enable pulse EP2 for the next detection circuit, and the process continues so that no more than one detection circuit is active at any time. This minimizes interaction between detection circuits if more than one conductive area is touched simultaneously.

Abstract: A linear control arrangement, of which a plurality may be provided in an audio mixing console, includes a fader potentiometer having a knob in which a tactile switch is recessed. The switch enables and inhibits recording and/or amending of the fader movement history, and allows ready overwriting or other amendment of existing fader movement data when required. The arrangement allows single finger operation of both the knob and the switch, as well as overcoming the need to provide separate space on the panel for the switch.