By virtue of their electrical properties, tubes generate a special waveform when they're saturated, which is why tube engineering has tremendous tonal advantages over solid state or DSP solutions, particularly for crunch and lead sounds. Tubes enter the saturation zone gradually or softly, which lends tube-driven tone its trademark yet totally unique character.
View post (What do you think of black/death metal?)
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I think some of it is a load of crap but some is really good. I prefer more technical death metal than just the primitive bands that try and be more heavy than any other band. I like the band "death". I think they are one of the best death metal bands ever. Also Children of bodom are amazing ... i'm guessing they would be under melodic death metal or something like that. Not really sure about black metal though.