Casio definitely thought about the student/teacher relationship when designing the PX-160. It has a duet play mode, which splits the keyboard into two halves. Each half is the same octave range (about three and a half octaves per side), so a teacher can demonstrate on one side while the student plays on the other at the same pitch. Two headphone jacks allow both players to use headphones without the need for a splitter. If the speakers are being used, they can also be configured to output sound from the left keyboard side to the left speaker and vice versa.
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]
Bass drum Muffling the bass can be achieved with the same muffling techniques as the snare, but bass drums in a drum kit are more commonly muffled by adding pillows, a sleeping bag or another soft filling inside the drum, between the heads. Cutting a small hole in the resonant head can also produce a more muffled tone, and allows manipulation in internally placed muffling. The Evans EQ pad places a pad against the batterhead and, when struck, the pad moves off the head momentarily, then returns to rest against the head, thus reducing the sustain without choking the tone.
When you hear a person humming music, what is it that you hear? Commonly, it's the bass line. Something about those low, rhythmic notes really have a big impact, with some of the best examples being "Seven Nation Army" by the White Stripes and "Under Pressure" by Queen. There are countless others you could surely name, but the bottom line is that the bass guitar is a crucial part of modern music and definitely an instrument to be proud of. Fortunately, with dozens of bass guitars for sale here, you're sure to find one that strikes the right chord with you.
Drummers use a variety of accessories when practicing. Metronomes and beat counters are used to develop a sense of a steady pulse. Drum muffling pads may be used to lessen the volume of drums during practicing. A practice pad, held on the lap, on a leg, or mounted on a stand, is used for near-silent practice with drumsticks. A set of practice pads mounted to simulate an entire drum kit is known as a practice kit. In the 2010s, these have largely been superseded by electronic drums, which can be listened to with headphones for quiet practice and kits with non-sounding mesh heads.