义甲触弦深浅变化对音色的影响：
The influence of the depth change of Yijia touch string on the timbre:
1、基本触弦点是甲尖至胶布的三分之一处，音色柔和、饱满。
1. The basic touch point is from the nail tip to one third of the adhesive tape, and the tone is soft and full.
2、触弦较深，义甲与琴弦接触的面积大，音色较为深沉、厚重。
2. The touch string is deep, the area between the Yijia and the string is large, and the timbre is deep and thick.
3、触弦较浅，义甲与琴弦接触面积小，音色轻快，颗粒性强，适用于快速轻盈的快板。
3. The touch string is shallow, the contact area between the Yijia and the string is small, the timbre is light, and the granularity is strong. It is suitable for fast and light allegro.