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 remember you well. I wondered where you had got to and if you were going to post here again. I think you were the one that tabbed out altitudes for me. Good to see you back here :D