Add [b]_pause()[/b] to [u]On Press[/u]  property and [b]_play()[/b] to [u]On Release[/u] property of [b]SliderN[/b].

Actually, you can find out the [b]run time error[/b] from EJS console when you run it.
The error message can lead you to find the bug or find way to solve it.