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.
Drummers often bring a carpet, mats or rugs to venues to prevent the bass drum and hi-hat stand from "crawling" (moving away) on a slippery surface from the drum head striking the bass drum. The carpet also reduces short reverberation (which is generally but not always an advantage), and helps to prevent damage to the flooring or floor coverings. In shows where multiple drummers will bring their kits onstage over the night, it is common for drummers to mark the location of their stands and pedals with tape, to allow for quicker positioning of a kits in a drummer's accustomed position. Bass drums and hi-hat stands commonly have retractable spikes to help them to grip surfaces such as carpet, or stay stationary (on hard surfaces) with rubber feet.
For musicians like us that play bass, we never seem to get the recognition we deserve! Without us serving up those intricate grooves or beefy low-end riffs, the sound of our bands just wouldn’t be the same! Here at Sam Ash, we want you to know that we truly appreciate you as a bass player no matter what level you’re at or what style or genre of music you play!