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 POD...

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signal, how the signal is colored and shaped, at what point it begins to distort, the 
quality and characteristic of the distortion – complicated stuff, but all analyzable 
as electronic data. A guitar pickup output, after all, is an electronic signal, and 
tubes are really just a complex form of signal processing.

The Line 6 engineers also directed their caffeine-enhanced attention to a study of 
guitar speaker cabinets, and the important part they play in communicating great 
guitar tone.

Having sussed it all out, the Line 6 engineers were then able to apply their digital 
expertise to develop software which simulates the signal processing of tubes and 
other electronics, as well as the speaker cabinets, entirely within the digital 
domain. Cool, huh?

This revolutionary DSP (digital signal processing) software-based modeling 
technology gives Line 6 the power to create super silicon-based life forms like 
POD: a tonally mind-blowing, multi-FX packed, shiny red wonder box with 
ultimate flexibility for creating awesome guitar tone....

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This modeling know-how allowed Line 6 to create software Amp and Cab Models 
modeled after a collection of amplifiers and speaker cabinets recognized by 
guitarists the world over as true “tone classics.” We got these amps and cabs 
together, cranked ’em up, and had a look at the electronic data generated by the 
tubes, transformers, capacitors, plate and grid voltages, tone control curves – and 
the whole mess of components and elements unique to each amplifier design. This 
research led to the creation of Line 6’s software Amp and Cab Models. These 
models were tweaked up through careful, scientific A/B comparisons to the gear 
that inspired them, with an ear open for the effects of different volume levels and 
settings of the originals’ tone and gain controls. The gain and equalization 
characteristics of the modeled amps were carefully measured so that changes to 
amp knobs on the models would mirror the effects of these changes on the 
originals as closely as possible. We’re talkin’ major attention to detail here. Tone 
control center frequencies, slopes, and cut/boost range were painstakingly 
analyzed, and we also carefully attended to the effect of presence switches, “bright” 
channels, and other model-specific factors. Not only that, but since these old amps 
have highly interactive circuits, we paid careful attention to the way that the