信号发生器和电子琴。其中电子琴有36个按键，跨3个八度，分别为小字组、小字一组和小字二组，可以播放含基音、泛音和包络的声音-Signal generator and keyboard. Keyboard comes with 36 keys which spans three octaves, respectively, for the small print group, the small print of a group and the small print of two groups, containing the pitch, overtones, and the sound envelope can play