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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I think Micheal Romeo is a good guitarist from what i have heard from symphony X. Just thinking about how simple and boring Tom Morello is. I dont understand how he could be so rubbish after being taught by angelo.