Sounds were at max for me I think. At least they spawned that way and I didn't touch them. Might have been my fault and a previous game had loud sounds which made me turn down the overall firefox volume but I forget at this point
For y sorting you need to adjust the pivot position to be at the bottom of the sprite and then that will be the point the y position will be compared against. All sprites also have to be siblings (or close to siblings, forget how exact it wants them but usually thats what people mess up on)