Volume Swell效果
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volume swell 是电吉他的一种效果，它利用了 amplification system（扩音系统）为音乐添加了一种 “crescendo”（音量逐渐加强）的效果。
有些时候它也被称为 “violining”。这个技巧很简单，用小指抓住电吉他的音量按钮，降低音量到 0，现在用没有声音的吉他，弹一个音，再调节音量按钮，把声音拉大。
As the creator of Hub Guitar, Grey has compiled hundreds of guitar lessons, written several books, and filmed hundreds of video lessons. He teaches private lessons in his Boston studio, as well as via video chat through TakeLessons.