To get custom colors, you have to copy and paste the HSB code into a 'Set Color' block to change the code "behind the block". Maybe, you could use the same method with Sound blocks. I don't know what sound files Hopscotch uses, but maybe we could put sound files into Sound blocks, like you put HSB code into Set Color blocks. Does anyone know what kind of sound files Hopscotch uses?
-Tori the Crafter