Line 6 Original inspired by the original high gain Big Bottom model
To create the Line 6 Badonk, the Big Bottom model from the XT code was rebuilt using new tools so that the overall EQ and pre-post distortion filtering matched. The previous tone stack was a little limited, so it was tuned up to have more range and provide a realistic, interactive response.
To make this model feel more like a full amp, the power amp from the Fatality model (mesa rectifier mod) was added then tweaked slightly to reinforce the overall EQ curve of the Big Bottom.
Tone Secret: The Big Bottom does not have a crap-load of low frequency. Instead, it is an amp with a slightly more than average amount of low end that can really hold together while being fed a lot of low frequency. It holds together well with heavily detuned guitars.