With the Road King amp, you're able to switch power tubes and speakers and do all these different things. And I didn't want to have five different heads in my rack. And there's something about, when you do the type of setup that I have, unless you have a dedicated amp to a dedicated speaker and you're actually switching, you have to use the same power section of the main head that you're using.
The first word gives origin to the second, the first and second to the third, and the third to the fourth, and so on. You cannot begin with the second word.