How does one go about moving gigantic illuminated panels across an opera stage without breaking anything – not least one’s back? Since their first appearance in a performance of the opera The Visit of the Royal Physician in 2009, the opera house LED panels had been causing calluses. Having to move their four 64m² LED panels around on stage by manually pushing and pulling them, the Danish National Opera was looking for a less demanding solution. To meet this need, Wahlberg provided a mechanical solution involving four DMX controlled motor units, one for each panel, allowing the LED panels to move effortlessly side-to-side. When the National Opera re-opened their production of The Visit of the Royal Physician in 2011, the LED panels were mounted onto the new sliding mechanism. Three elements make up this DMX controlled I-Track motor system: an AC motor, an advanced positioning system and a 370W AC Motor Controller. All of these are built into a cart that fits directly on an I-beam.