Welcome! This is an cool feature for making simple songs. If people like this, I will add a pro version, where you can change the instruments, and play more notes. How does this work? 1. Set speed to 0, so your drawing don't moves. 2. You can draw in the raster, and play it by just change the speed... under the 0, the song will play like you drawed it, above it will play it just the other way.
Like+fav for cool updates!