Gibson Les Paul Recording owners manual page 3
Description of controls (cont.)
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The 11 position decade control "tunes" or alters the treble harmonics. Position 0 will peak the highest frequency and graduates accordingly down the spectrum in steps through position 10. This control is most effective when the tone selector switch is in position 2 and the bass response has been reduced. You will experience innumerous tonalities when used with the phase, treble and pickup selector toggle switch
The demonstration disk that came with the 1971 Low Impedance for High Performance brochure demonstrates some of the sounds available - listen to the clip 'Want to get highs?' reproduced on that page to hear how the decade switch can interact with the other controls for some very interesting sounds.
This page also explains the operation of the tone switch - perhaps the least intuitive control that this guitar offers. Perhaps a better name for this switch would have been "mode" or "bypass" rather than "tone". It's function in positions 1 and 3 is to bypass some of the other controls - enabling switching between wildly different (but pre-defined) sounds quickly and easily.
The phase switch sets the two pickups in, or out of phase with each other. Naturally this will only work if both pickups are selected, and works optimally if the relative output amplitudes from each pickup is matched.
An exciting new sound can be achieved by moving the switch to "out phase" position. The two pickups will then produce opposing signals. IMPORTANT: when you desire an "out-of-phase" tonality, the pickup selector switch must be in the center position
Obviosly only the neck is pictured here - see the previous page for the rest of the guitar. The Recording guitar has a three-piece quarter-sawn mahogany neck, with rosewood fretboard, mother-of-pearl block position markers and split diamond motif - the same headstock markings as the Les Paul Custom, though of course, the Custom had an ebony fretboard and gold plated hardware. 22 frets, 24 3/4" scale, width at nut 1 11/16".