Gibson Les Paul Recording owners manual page 4
Technical specifications | Suggested tonal settings
Guitars and Parts for Sale
This page details a number of suggested effects settings for the Les Paul Recording guitar. Four Rock settings and two Country settings. Some of these sounds can be heard on the Les Paul Recording flexi disc that came with 1971 Low Impedance brochure. Have a listen.
The Gibson #640 strings listed are Stainless Steel, medium gauge with a wound 3rd: .012 - .057.