Hey xUrsaMajorxx,
Selecting an Emerald driver gives you two options, I believe. Without sound, or with sound.
Adding sound would give you an Obsidian V3 board as a minimum, since the Emerald driver would need lithium batteries, and Obsidian lite boards run on normal alkalines.
Pommel selection has nothing to do with the electronics, but sabers with sound do require vented ones.
I hope this helps.