Erhu is chinese two-stringed bowed musical instrument.
You can select the tuning.
You can change the position and size of the number.
You can be displayed under the selected notes or measure.
To install the plugin follow the installation intructions.
Plugin files are Erhu.js and Erhu.ui.
Install the fonts on your system.
Font files are ErhuS.ttf and ErhuF.ttf.
A detailed description of Japanese: URL