Extended-range basses (ERBs) are basses with six to twelve strings—with the additional strings used for range rather than unison or octave pairs. A seven-string bass (B0–E1–A1–D2–G2–C3–F3) was built by luthier Michael Tobias in 1987. This instrument, commissioned by bassist Garry Goodman, was an early example of a bass with more than six single course strings. In 1999 South American ERB player Igor Saavedra designed one of the first eight-string ERBs known, and asked Luthier Alfonso Iturra to build it for him.  Conklin builds custom ERB basses. The Guitarbass is a ten-string instrument with four bass strings (tuned E–A–D–G) and six guitar strings (tuned E–A–D–G–B–E). Luthier Michael Adler built the first eleven-string bass in 2004 and completed the first single-course 12-string bass in 2005. Adler's 11- and 12-string instruments have the same range as a grand piano. Subcontrabasses, such as C♯–F♯–B–E (the lowest string, C♯0 being at 17.32 Hz at around the limit of human hearing) have been created. Ibanez had released SR7VIISC in 2009, featuring a 30-inch (762 mm) scale and narrower width, and tuned as B–E–A–D–G–C–E; the company dubbed it a cross between bass and guitar.[better source needed]
However, with the technological advances, recent digital pianos are mostly capable of recreating string resonances, reverberations and other acoustical effects via digital signal processing (DSP) and modeling technology. One example is the Casio Privia, which is able to generate such acoustical effects by means of a simple DSP, which is far less complex than physical modeling.
Toward the end of the 1920s, variations of the hi-hats were introduced. One of the most popular hand held hi-hat cymbal variations used was called the "hand sock cymbals". The reason for the name "hi-hat" was because earlier versions of the hi-hat were referred to as a "low boy". The evolution that became the "hi-hats" allowed drummers to play the two cymbals with drum sticks while simultaneously controlling how open or closed the two cymbals were with their foot. The pedal could also be used to play the cymbals with the foot alone, while the right hand played other drums. By the 1930s, Ben Duncan and others popularized streamlined trap kits leading to a basic four piece drum set standard: bass, snare, tom-tom, and a larger floor tom. In time, legs were fitted to larger floor toms, and "consolettes" were devised to hold smaller tom-toms (ride toms) on the bass drum.
Fender's Bass Guitar is right at the top of the market, thanks to its robust, buzz-free sound and excellent playability. It features a classic light wood finish that looks great and a graphite-reinforced neck. It also comes with responsive, lightweight tuning pegs that won't slide out of tune easily, as well as a real high-quality bridge that doesn't buzz.
There are a range of different string types including all-metal strings, which are available in many varieties of winding or finishing, each of which produce different tone, including roundwound, flatwound, halfwound, ground wound, and pressure wound); as well as metal strings with different coverings, such as tapewound and wound with plastic coatings. The variety of materials used in the strings gives bass players a range of tonal options. In the 1950s and early 1960s, bassists mostly used flatwound strings with a smooth surface, which had a smooth, damped sound reminiscent of a double bass. In the late 1960s and 1970s, players began using roundwound bass strings, which produce a brighter tone similar to steel guitar strings, though flatwounds also remained in use by players seeking a vintage tone. Roundwounds have a brighter timbre (tone) with longer sustain than flatwounds.
A number of accessories are designed for the bass drum (also called "kick drum"). Ported tubes for the bass drum are available to take advantage of the bass reflex speaker design, in which a tuned port (a hole and a carefully measured tube) are put in a speaker enclosure to improve the bass response at the lowest frequencies. Bass drumhead patches are available, which protect the drumhead from the impact of the felt beater. Bass drum pillows are fabric bags with filling or stuffing that can be used to alter the tone or resonance of the bass drum. A less expensive alternative to using a specialized bass drum pillow is to use an old sleeping bag.
The introduction of the electric bass in jazz fusion, as in the rock world, helped bassists play in high-volume stadium concerts with powerful amplifiers, because it is easier to amplify the electric bass than the double bass (the latter is prone to feedback in high-volume settings). The electric bass has both an accompaniment and a soloing role in jazz. In accompaniment, the bassist may perform walking basslines for traditional tunes and jazz standards, playing smooth quarter note lines that imitate the double bass. It is called a walking bass line because of the way it rises and falls using scale notes and passing notes.
Five strings usually tuned B0–E1–A1–D2–G2, providing extended lower range. Another common tuning on early 1970s five-string basses added a high note instead of a low note: E–A–D–G–C, known as tenor tuning. This tuning is still popular among jazz and solo bassists. Other tunings, such as C–E–A–D–G are rare. Some bassists like C as the lowest pitch because that's the lowest note on an upright bass with a C, and C is a common note in a few popular keys C (e.g., C major, G major, F major). Some players may detune the lowest string to B♭ or A. B♭ is common for bassists who play in brass bands, as B♭ is an important and common key for this type of ensemble. Relative to a four-string bass, the fifth string provides a greater lower range (with a low B, C, or A) or a greater upper range (with a high C or B is added) and provides more notes for any single hand position. The earliest five string was created by Fender in 1965. The Fender Bass V used the E–A–D–G–C tuning, but was unpopular and discontinued in 1970. The type of low B five-string was created by Jimmy Johnson as a custom instrument in 1975. He bought an E–A–D–G–C 5-string Alembic bass, replaced the nut, and used a new, thick low B string from GHS. Steinberger made a 5-string headless instrument called the L-2/5 in 1982, and later Yamaha offered the first production model as the BB5000 in 1984.