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.
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It really annoys me when people that dont know any theory and i'm talking about people who dont know the difference between E and E minor. Then you get people saying how good they are. Also i find it stupid when people that dont have lessons tell me that lessons are bad and that you dont pick up your own style.