Shape and Form
The physical form of a digital piano can vary considerably. Most vaguely resemble a low upright piano (but usually lacking a fully enclosed lower section). Others, notably Yamaha's "GranTouch" range are based on the casework of traditional upright or grand instruments. An opposite and recent trend is to produce an instrument which has a unique and distinctive appearance, unobtainable with a conventional instrument. Yamaha makes a model which is designed to stand against a wall and is far shallower from keyboard to back than any possible upright design.
Yet another form is the "stage piano", designed for use with a live band. This type of digital piano normally makes no attempt to imitate the physical appearance of an acoustic piano, rather resembling a modern 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.
There are also digital piano modules, which are simply keyboardless sound modules chiefly containing piano samples. One early example of a digital piano module is the Roland MKS-20 Digital Piano.
Read more about this topic: Digital Piano
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