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GTDAudio, A premier wireless microphone power amplifier, ( apply to G-622, G-733, G-788, G-787 models only ) 3, Manual channel selection:. After digging around, I found the GTD Audio systems like the 622H, 733H, or the 788H, I cant even get a Manual on one of their Boards from them.Gtd-Audio's G-733H wireless microphone system delivers superior sound quality and professional features. It is designed for a wide range professional