1. 對於按鍵輸入，請加入聲音輸出電路，分別代表sw1之按鍵回授之音效訊息。每次sw1按鍵壓下時，就送出0.1秒之1KHz聲音。-1. For the key input, please join the voice output circuit, representing the keys sw1 feedback of the audio message. Every time when sw1 button depressed, they sent 0.1 seconds of sound