Adding a new notehead pattern/design/symbol
I would like to add a new notehead design in my noteheads palette. I tried to drag and drop some png and jpeg images, as it says you can do, but, although is apperas i can copy these images onto the palette, it actually doesn't keep them. I would expect to see my pattern/design/image among the other noteheads in the palette, but it doesn't occur. Is it imposible ? If the, why are there empty cells in the palette, why does it suggest to drag and drop more notehead designs ? Or sould I use a special type of design extension that wouldn't be jpeg or png ?
Other question : I would like to use this design with stems as usual but under the pentagram and without additional line on it. Is it posible ?
Thank you !