Hi Dominic, welcome to the board, and congrats on picking up an Epic and a Spoiler. As Kenn mentioned, a description of the Spoiler controls can be found in our FAQ section
here.
The pots on both of your basses are sealed, self-cleaning pots. If the pot is scratchy, just turn it back and forth for its full rotation twenty or thirty times.
There is a lot of information in the FAQ and Must Reads section. But if you still have questions, just ask; someone will usually jump in when they run across the thread.