A circuit for processing multichannel audio signals, comprises a frequency characteristics correction device and an output device. One embodiment is an apparatus that includes a host system and a HBA. The insulation bricks may be adapted such that they can cooperate to form an insulating barrier between the device under test and the testing apparatus. In use, the lance is inserted into the process vessel while the process vessel is at or near its high operational temperature so that the nozzle structure is positioned adjacent to an area of the process vessel wall in need of repair, and so that the lance may be manipulated from outside the process vessel during repair of the wall thereof. The second electrically insulating layer also extends on a second sidewall of the first semiconductor active region. Finally, the first, second, and the third sorting conditions are transmitted to respective fields where the recycling item and the recycling parts are sorted.