CESSB and PROC control

You can turn the Processor off completely, or run it in Normal mode (NOR) and AM sounds great. I usually keep it in NOR for AM. It keeps things more steady without adding much compression effect. My understanding is that CESSB IS the processor, pretty much, and the three different levels of NOR, DX, and DX+ control the degree of enhancement, with DX+ also adding some high boost. I don't recommend either of the two higher settings for AM. If you want to add some additional punch, adjust the TX EQ to bring out more highs, etc.