How could you use a USB Midi master keyboard in the same way as an ordinary digital piano (i.e. standalone)?

by Planetrussell
Question by jeremy789088: How could you use a USB Midi master keyboard in the same way as an ordinary digital piano (i.e. standalone)?
basically, i would like to get a midi controller keyboard to run like a standalone synth. without having to plug it into a computer, install software, play it though the computer, and all that jazz. just plug into an amp or headphones would be good and simple. im guessing thats not the case..

maybe midi controller keyboards can run sounds by

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