1979 Boss SG-1 Slow Gear Split-Shaft Mark Bass are one of

Mark Bass are one of the pre-eminent manufacturers of bass-related equipment

There's some neck dive present

Super straightforward headphone amp with two channels: clean and distortion

The Turquoise wrap at the back has a split that appears to be currently stable

1979 Boss SG-1 Slow Gear Split-Shaft Mark Bass are one ofA rare beast indeed from the catalog of pedal titans, Boss! Manufactured between 1979 and 1982, the SG 1 has become one of the most desirable and hardest to find Boss pedals. Best way to describe the sound is as if you had a pedal that replicated the volume swells you do on your guitar with your volume control. Cosmetic condition is good for its age with small amounts of enclosure wear present. Hardware and electronics are fully functional. No box