Les discovered the solution to this was lo-impedance input. Gibson added this feature to their Les Paul Recording model. The guitar came with two slanted low impedance pickups with Gibson logo molded on covers.
In other words, with the transformer off for recording in a studio plugged directly into the board, the low-impedance mode gave much cleaner tracks and broader frequency bandwidth that could be tweaked in the mix.
The pickups were produced for Gibson by a company that eventually would be known as EMG.
the music that Les played.