The guy doesn't know what the switch does, says it affects the entire frequency spectrum but it's a 3 way mid switch. Interestingly configurable between two presets so 6 to pick from in total.
Although they look great I don't like the marketing stuff (especially when he gets other details wrong) about how the body shape was designed from the ground up, it's a tweaked Cort GB and even nicks the scratchplate from that bass.