A Mixed Media Reality system and associated techniques are disclosed. The rotation mechanism is mounted on a mechanism which moves the effect wheel from a position outside of the light path to a position in which the effect wheel intersects the light path to provide a continuous wheel effect. The current paths are eliminated within the IO interface even while the IO interface is not receiving operational power, or while the IO interface is in a power-on reset condition. Thereby, labour efforts and costs can be minimised, and delivery form and details are automatically determined based on the received message data stream for each individual message, without requiring any separate supervising control signalling.