The sound principle of the electric piano is to use the keyboard as the on-off switch to form an electric pulse. Once the key is pressed, the internal crystal oscillator starts to work, forming a pulse to generate a certain frequency waveform, and then it is amplified by the frequency divider and sent to the speaker for sound. The whole sound production process depends on a simple frequency division analog circuit, so the keyboard has no force and string feeling, and the sound is relatively mechanical and monotonous.

The live performance effect of piano performance is mostly affected by the sound equipment. If the quality of the microphone responsible for collecting the piano volume is general or not professional enough, the piano timbre we hear on the scene is very difficult to be satisfactory, and the electric piano can be easily connected with the sound equipment such as the mixer at the performance site through an audio output line, and its original timbre is maintained as far as possible.