If you can find one, get your hands on the 6-button footswitch. It's made to work with the DSL 40CR, DSL 100HR, and /or the JVM. I got one for mine and its AMAZING! It basically changes it into a 4 channel amp because there's an independent switch dedicated to each each voicing ( 1- clean 2- Crunch 3- OD 1 and 4- OD 2 ) and then switch 5 and 6 are for switching between master volumes and an effects loop bypass.
Congrats on your new amp man! It's a BEAST! Lots of awesome pure Marshall goodness packed into one package! Hope you enjoy it! Cheers