Since 1996, Hong Chulki from Seoul, Korea has been the founder and the member of the first Korean noise music group Astronoise (with Choi Joonyong). As a noise improviser, he has been playing mainly with feedback, amplifying the audio signal that passes through the audio devices, such as turntable, MD player, and laptop computer, and etc. In 2007, he has released two turntable solo discs, "Surface & Feedback" and "Without Cartridge/With Cartridge." He has also been active as an experimental film music.