In general, the sounds produced by a digital piano are based on sampling, by which real piano sound samples are stored in ROM. The samples stored in digital pianos are usually of very precision recording and made using high-quality pianos, expensive microphones, and high-quality preamps in a professional recording studio. ROM may include multiple samples for the same keystroke, attempting to reproduce diversity observed on the real piano, but the number of these recorded alternatives is limited.
On the topic of performing: is it the stage you have your sights on? In that case, set your sights on stage pianos, like the Roland RD-300NX for example. Powered by Roland's proprietary "SuperNATURAL" sound engine, it's so true-to-life that an audience just might find themselves wondering where you've hidden the baby grand. Another great suggestion is the Nord Stage 2 88-Key Stage Keyboard, which uses three sound-generating sections working together to provide outstanding versatility.
A player can use the fretting hand to change a sounded note, either by fully muting it after plucking it, or by partially muting it near the bridge to reduce volume, or make the note fade faster. The fretting hand often mutes strings that are not being played to stop sympathetic vibrations, particularly when the player wants a "dry" or "focused" sound. On the other hand, the sympathetic resonance of harmonically related strings are sometimes desirable. In these cases, a bassist can fret harmonically related notes. For example, while fretting a sustained "F" (on the third fret of the "D" string), underneath an F major chord being played by a piano player, a bassist might hold down the "C" and low "F" below this note so their harmonics sound sympathetically.
Drum sets are the backbone of your band. Keeping the pace and driving the rhythm section, the drummer makes sure that everything clicks. With that in mind, it's important that every drummer have a quality drum kit to keep them sounding their absolute best. The real benefit to purchasing a complete kit as opposed to individual components is convenience. You won't have to take the time to pore over separate drums, searching for just the right complementary sounds. These kits are made up of drums that are designed to sound great together from day one, allowing you to focus on your playing.