利用实验仪键盘，使数字键1、2、3、4、5、6、7作为电子琴键，按下数字键发出相应的音调，PB0作为定时器门控信号，OUT1发出音频信号，驱动喇叭。
Experimental instrument keyboard, the numeric keys 1,2,3,4,5,6,7 as electronic keys, press the number keys issued tone PB0 as timer gating signal, OUT1 issue audio signal to drive speakers. (2013-04-13, Video, 1KB, 下载3次)