Controls and Features
Stage pianos usually have a smaller selection of sounds than digital electronic keyboards and synthesizers. Instead of the hundreds of sounds and complex oscillator controls available on a high-end, professional synthesizer, they often have only a few sounds, typically acoustic piano, electric piano, and Hammond organ. Also, instead of scrolling through the on-screen menus used on synthesizers, stage pianos are usually controlled with knobs and buttons.
Stage pianos differ from inexpensive home digital keyboards in a number of ways. Home digital keyboards provide a hundred sounds, ranging from imitation electric piano and flute sounds to buzzy synth-style sounds. However, the imitation sounds are created by relatively simple synthesis methods, rather than by sampling or complex Digital Signal Processing-modelling, as in the case of a high-end stage piano. This means that the sound quality of the Casio CTK-533 presets are not suitable for a professional performance.
Stage pianos often have a heavier, more robust body, which is better able to withstand the stress of heavy touring. Unlike digital pianos designed for home use, they do not have a fixed stand or fixed sustain pedals. Instead, they are designed to be used with a separate portable stand and portable sustain pedals.
While almost all digital pianos and lower-end synthesizers designed for home use have small onboard powered speakers, stage pianos are often designed without onboard speakers; instead, they are designed to be used with external amplification. While small, low-powered amplified speakers may be appropriate for in-home use, they cannot provide sufficient power for on-stage monitoring in rock and jazz performance settings. While most onboard powered speakers produce between 10 and 30 watts per speaker, a typical professional keyboard amplifier will produce over 300 watts. Nevertheless, some stage pianos, such as the Yamaha P-250, do have onboard powered speakers.
Most stage pianos provide a recreation of the electro-mechanical electric pianos that were based on amplifying the sound of a metal tine, reed or string hit by a hammer, such as the Fender Rhodes, Wurlitzer 200A or Yamaha CP-70/CP-80 series. Instead of using tines or strings, stage pianos reproduce sound electronically by the use of sampled or digitally modelled sounds. They usually have MIDI interfaces to permit them to be used as master keyboards, which can control other tone-generating modules, such as Hammond organ-emulators or synthesizer string modules.
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