It also seems to me that part of the allure of metal was in an ambiance that was provided by the old tape machine analog recording methods, which sounds superior to the digital recording of today. Black Metal knew this, and that gave rise to the "kvlt" style of recording. It worked with Darkthrone but has been mercilessly abused since. The worst side effect of this is what bands like Toxic Holocaust do when they use digital machines to record wannabe low-fi retro junk. I don't know a whole lot about the old recording techniques, so perhaps someone could add to this.