How do I use KM correctly to toggle macOS dictation mode?

[kcwhat]

Right. Peter discussed this before. Here is one time it was discussed.

How to: Option+F8 as a shortcut? (F keys)

Lets be clear on this. The Fn key is a key mostly only on MacBooks that acts as a hardware toggle on the function keys, and toggles them between function keys (F1, F2, etc) and hardware keys (volume up/down, brightness up/down, etc). The Fn key is not a modifier. It is not like Shift or Control. The is no such thing as Fn-K - Fn-K is just K. The Fn key only operates on the function keys (and sometimes a few other keys like Page Up/Down). And it does not operate as a modifier, it changes th…