双吟paired vibrato
Pinyin: shuāng yín
Vibrato and glidesTwo plucks on the same string, each with a yin of the same moderate speed.
How it is played
Two notes in succession on one string, both with yin at the same pace, taking the middle way, without the slow-then-quick change.
How it sounds
The two rings answer each other, even and steady.
In the classical handbooks
一絃兩彈，俱用中和之音而吟者。Gist: Two plucks on one string, both vibrated with a moderate, balanced tone.
同絃兩彈，俱要用吟，非緩急吟之說也。Gist: Two plucks on the same string, both with yin; this is not the slow-and-quick yin.
Easily confused with
- 缓急吟huǎn jí yín· slow then quick vibratoHuan ji yin goes slow then quick; shuang yin treats both notes alike.