Jol Dantzig of Hamer Guitars was the builder of the first 12-string bass, which expanded the 8-string bass concept by adding one more additional octave string to each bass string.
Jol Dantzig of Hamer Guitars was the builder of the first 12-string bass. String bass expanded the 8-string bass concept by. String bass was adding one more additional octave string to each bass string.