What do Bon Jovi, Westlife, Sammy Davis Jr. and KPMG have in common? Nov 22, 2007 I didn’t realise “modulation” inspired such vitriol. (I also didn’t know that it’s colloquially known as the “Truck Driver’s Gear Change”.) Here’s a Truck Driver’s Gear Change that you should know by heart. Here’s another. And another. And another. Wow, there’s a lot. But this one is undoubtedly the most notorious.