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. [38] Conklin builds custom ERB basses.[39] 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).[40] 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.[41] Subcontrabasses, such as C♯–F♯–B–E (the lowest string, C♯0 being at 17.32 Hz at around the limit of human hearing)[42] 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.[43][better source needed]
In some styles of music, drummers use electronic effects on drums, such as individual noise gates that mute the attached microphone when the signal is below a threshold volume. This allows the sound engineer to use a higher overall volume for the drum kit by reducing the number of "active" mics which could produce unwanted feedback at any one time. When a drum kit is entirely miked and amplified through the sound reinforcement system, the drummer or the sound engineer can add other electronic effects to the drum sound, such as reverb or digital delay.
A fully electronic kit is also easier to soundcheck than acoustic drums, assuming that the electronic drum module has levels that the drummer has pre-set in her/his practice room; in contrast, when an acoustic kit is sound checked, most drums and cymbals need to be miked and each mic needs to be tested by the drummer so its level and tone equalization can be adjusted by the sound engineer. As well, even after all the individual drum and cymbal mics are soundchecked, the engineer needs to listen to the drummer play a standard groove, to check that the balance between the kit instruments is right. Finally, the engineer needs to set up the monitor mix for the drummer, which the drummer uses to hear her/his instruments and the instruments and vocals of the rest of the band. With a fully electronic kit, many of these steps could be eliminated.
Of all the instruments in the band, drums and percussions have a role that's one of the most unique - and also one of the most important. When you play the drums, you're setting the pace and creating the song's rhythm. It's up to you to really get your listeners feeling the music. That's a tough challenge, but it's also a fun and rewarding thing to do. Here in this section, you'll find all the drums and percussion essentials to get it done.

Eight and twelve-string models are both built on the same "course string" concept found on twelve-string guitars, where sets of strings are spaced together in groups of two or three that are primarily played simultaneously. These instruments typically have one of the strings in each course tuned an octave above the 'standard' string, although a fifth above is also used. Instruments with ten and fifteen strings, grouped in five courses, also exist, as do "extended-range basses" or ERBs with non-coursed string counts rivaling those of coursed-string basses.
The keyboards all came in to our Los Angeles office. After unboxing them and setting them up, I invited Liz, Jack, and Brent to come in and try them out. I asked them to rate the key action and the sound of the piano and to evaluate features from the perspective of a beginner. After playing through all of them over a couple hours, we talked through the pros and cons of each keyboard, and they gave me their top three choices.
Since there are so many digital pianos worthy of your attention in this catalog, you may want to narrow down your choices using some of the search options on the sidebar. For example, if you select stage digital pianos under the category section, you'll be presented with all the digital pianos that were made for the stage. Once here you have the opportunity to drill down even further and can search by topics like number of keys, MIDI/USB Connections or by whether or not the digital piano has built-in speakers. 

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