It sends out what's called a MIDI signal -- or a Musical Instrument Digital Interface -- through these wires into the box and then the computer, which then trigger high-quality piano samples like this.
它传递所谓的MIDI信号 也称为乐器数字界面， 通过这个电线传到盒子和计算机中， 然后产生了象这样高质量钢琴声。