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 (Fastest guitarist you know!!!)
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And danny joe carter. I pretty sure he is not human either. I thought people like michael angelo could pick fast but after seeing some danny joe carter vids i realised there was a definate speed difference.