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Effective multitouch interaction does not reduce itself to a simple tracking of five fingers, there are several emerging effects that could prevent intuitive interaction in industrial appliances. This use-case describes practical challenges that were documented during the design and implementation of a holistic user interaction design in the domain of high-end audio equipments. The engineering process had to combine tangible user interface controls with state-of-the-art multitouch software fader panels in an intuitive way. This work also gives some background information about complex distributed audio routing equipment and user interaction along with technology and usability issues that appear during the design of a multitouch appliance. Several experiments were implemented in order to gain empiric data to substantiate our practical findings.