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The original 4558 based circuit uses transistor buffers at both the input and the output, to improve impedance matching.
Your guitar appears to be a Les Paul Custom copy that Ibanez labeled Model 2391.
It is widely used in genres as diverse as country, blues and metal.
The Tube Screamer has since spawned many clones and modified versions.
Possible modifications include use of mismatched, or different diodes (for example, a silicon and a germanium device), or more than two diodes in various arrangements, or modified tone circuits.
It is also used by the majority of metal guitarists before the lead channel of the high gain amps to make distortion more focused and to cut the low end.
The drive knob adjusts gain, the tone knob adjusts treble and the level knob adjusts the output volume of the pedal.