at all, but rather as hollow-bodied bass guitars. There are also semi-acoustic basses such as Godin Guitars' "A-Series" that, once amplified, sound much closer between acoustic bass guitars and upright basses (double bass), and have been used in professional circles to "simulate" one when it would be impractical for transportation and other reasons to use a full-sized upright bass. As with semi-acoustic electric guitars, the line between acoustic instruments fitted with pickups and electric instruments with tone-enhancing bodies is sometimes hard to draw. Some instruments can also be equipped with a variety of pickups such as piezo pickups, the "standard" of acoustic-electric instruments as well as synth pickups that can replay "virtual" upright bass sounds and bring a semi-acoustic bass much closer to a double bass sonically. Saga Musical Instruments produces a four-string bass resonator guitar under their Regal brand name.videos National Reso-Phonic Guitars also produce three models of resonator bass guitar. One notable player of the resonator bass guitar is Les Claypool of Primus, who plays Regal RD-05 resonator basses. Manufacturers Other manufacturers of acoustic bass guitars (not mentioned above) include Alvarez, Ibanez, Baton Rouge, Boulder Creek Guitars, Breedlove, Chesbro Music Company (Teton Guitars), Cort, Crafter, Jerzey, Dean, Eko, Epiphone, Eston, Fender, Furch, Gibson, Gold Tone, Guild, Ibanez, Larrivée, Lindo Guitars, Luna Guitars, Martin, Maton, Michael Kelly, Oscar Schmidt by Washburn, Ovation and its subsidiary Applause, Ozark, Prestige, Ribbecke Halfling Bass, Samick, Sigma Guitars, Sunlite, Sandberg, Spector, Stagg, Tagima, Tacoma, Takamine, Tanglewood, Taylor, Vintage Guitars, Washburn and Warwick. Mexican bass guitars Traditional music of Mexico features varieties of acoustic bass guitars. The guitarrón is a very large, deep-bodied Mexican 6-string acoustic bass guitar played in Mariachi bands. The bajo sexto, with six pairs of strings, resembles a twelve-string guitar tuned an octave lower. The heavy gauge strings generate a large string tension, yet the guitar is built relatively lightly. Musicians began to adopt the bajo sexto in Texas in the 1920s with the rise of "Tex-Mex" music, and it remains in common use for parts that would be played by the piano in traditional American popular music. The tuning of these instruments is (capital letters are an octave lower than small letters): Baja sexto: Ee Aa Dd Gg Cc Ff Bajo sexto: Ee Aa Dd Gg Bb ee Other Latin American acoustic bass guitars exist as well, such as the Bordonua. Gallery See also Bass guitar Contrabass guitar Double