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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Maybe those two letters are "gg", i'm not sure though. I heard that busted didnt really play instruments and havnt really watched them much. Anyway the fact is i think they are quite pitiful.