Excuse me, how to make a dynamic title with sound and shadow X2?

X2 "Tools for Drawing Sounds and Shadows" or track has a "Drawing Creator". After opening, set the color and thickness of the brush, write in the drawing board, record the writing process with the recording button, and generate it into the video material column after confirmation. Then drag the video of this writing process in the material bar to the overlapping track and adjust the size and position of the display. If the background color is set carelessly, the image will become opaque and the video track will not be visible. Use the "mask and chroma key" to extract the background color and remove it, and it will be transparent, only the image written in strokes.