The fretting hand—the left hand for right-handed bass players and right hand for left-handed bass players—presses down the strings to play different notes and shape the tone or timbre of a plucked or picked note. One fretting technique is a finger per fret, where each finger in the fretting hand plays one fret in a given position, giving the advantage that full chromatic scale of over an octave and a half can be played with no up-down wrist movement. Also, the double bass-style technique can be used for fretting. This technique involves using four fingers in the space of three frets, especially in the lower positions (i.e., the fretting positions closer to the nut, where the space between notes is the widest). When considering the spacing between notes, this is a comfortable distance for the average person's hand size, however it requires more up-down hand movements. The main advantage of the "four fingers in three frets technique is less tendon strain, leading to a diminished likelihood of Repetitive Strain Injury (RSI). The image below (of a bassist performing tapping) shows the four-in-three.
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 next thing that you need to consider is whether the bass guitar has frets or not. Having bass guitar with frets makes it quite easier to play and one will be able to produce a more consistent tone. The advantage of going with a fretless bass is that it will produce a more unique sound. It is also best to produce the vibrato effect that you hear often in the popular musical styles like Funk and Jazz. As a beginner, you can start out with a bass with frets.
Maybe you've already got a specific brand in mind and want to see all the digital pianos they offer. All you have to do is click on the brand on the left hand side of the screen and within a few moments you'll have access to everything that's available. For that matter, you can always play is safe and stick to the top-rated items…and there are plenty of those in this selection.