In piano lingo, “action” describes the way the piano keys feel when you press on them. With a digital piano, the closer the action is to that of an acoustic piano, the better. Semi-weighted action uses a spring to create the resistance felt when pressing a key and its rebound when you lift your finger. Hammer action uses a hammer mechanism like that found in an acoustic piano to replicate the feel. Graded, or progressive, hammer action takes that a step further by increasing the weight of the action as you descend to the lower notes on the keyboard. Using a keyboard with weighted action is beneficial for multiple reasons. It helps build finger strength while practicing (a spring-based action will only minimally address this), and it allows for more variation and musicality in the way you play a note. While a piano keyboard might look like nothing more than a bunch of on/off switches, in reality there’s a range of volumes and timbres that can be achieved depending on how quickly or strongly you depress the keys. Hammer action best replicates those possibilities.
Chords are not used that often by electric bass players. However, in some styles, bassists may sound "double stops", such as octaves with open strings and powerchords. In Latin music, double stops with fifths are used. Robert Trujillo of Metallica is known for playing "massive chords"  and "chord-based harmonics"  on the bass. Lemmy of Motörhead often played power chords in his bass lines.
Another common form is the stage piano, designed for use with live performances, professional audio, or in recording studio. This type of digital piano normally makes no attempt to imitate the physical appearance of an acoustic piano, rather resembling a generic synthesizer or music workstation. A distinguishing feature of most stage pianos is a lack of internal loudspeakers and amplification - it is normally assumed that a powerful keyboard amplifier or PA system will be used. However, some stage pianos are equipped with powered speakers.
The Yamaha falls a bit short on sound quality, though. It offers 10 sounds, but as Brent (who owns a P-45) put it, only three are usable: Grand Piano 1, Electric Piano 1, and Vibraphone. The Grand Piano 1 sound is the only one that has a button on the console for selection (it doubles as the Function button). The others are selected the same way as with the Casio—with a hold of the Function button and the press of a piano key—but the sounds are all assigned to the lowest octave on the keyboard, so you have to look and reach to the far left of the keyboard to change them.
Most electric bass guitars use magnetic pickups. The vibrations of the instrument's ferrous metal strings within the magnetic field of the permanent magnets in magnetic pickups produce small variations in the magnetic flux threading the coils of the pickups. This in turn produces small electrical voltages in the coils. Many bass players connect the signal from the bass guitar's pickups to a bass amplifier and loudspeaker using a 1/4" patch cord. These low-level signals are then strengthened by the bass amp's preamplifier electronic circuits, and then amplified with the bass amp's power amplifier and played through one or more speaker(s) in a cabinet.
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.
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