Yiyu Zhou

An icon that has the same color as the background is invisible you can see the icon by hovering over it I could not think of a good way though...

There is a package called [physics](http://mirrors.ibiblio.org/CTAN/macros/latex/contrib/physics/physics.pdf) which has a command `\mel**{n}{\grande}{m}` that adjusts the height of the vertical lines and the angled bracket very nicely, I would like to use...