Modelling amps try to emulate this effect sometimes, when using crunchy or overdriven tones for example. In the case of an analogue valve (or tube) pre-amp section, such analogue break up or distortion can often be pleasing and desirable to the human ear as it adds additional harmonic elements to the signal and does not clip in the same way that a transistor or digital amp would (which often sounds harsh by comparison and can introduce digital artefacts to the sound). passive v active pickups, etc.) or, for tonal effect to deliberately overdrive the pre-amp section and cause it to “break up” or distort. The pre-amp gain (or input gain) of your amp determines how much your initial signal is amplified by and can normally be adjusted to either accommodate different levels of output of different guitars (e.g. It is the pre-amp section of your amp that your amp’s tone controls (typically bass, mids and treble) apply to and where you can begin to shape your sound.
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