In one embodiment, a method includes receiving audio at a plurality of microphones, identifying a sound source to be muted, processing the audio to remove sound received from the sound source at each of the microphones, and transmitting the processed audio. The invention thus relates to the plants, seeds and tissue cultures of the variety CH823049, and to methods for producing a corn plant produced by crossing a corn plant of variety CH823049 with itself or with another corn plant, such as a plant of another variety. Said preparations further contain one or more lipids, one or more non-ionic andor anionic emulsifiers with HLB values between 8 and 16, the overall content of the emulsifiers not exceeding 1. Means are provided for detecting the position of the box with respect to the support and means are also provided for modifying the operating mode as a function of the detected position of the box.