[Elecraft] KRX3

[Tom W8JI]

I just finished putting together a K3, I've looked at the 
manuals, and I have a question.

I have identical filters in the main and second receivers. 
Stock filters plus FL2  2.1kHz and FL3  400Hz.

How do I know the roofing filters in the KRX3 are being 
selected? Are they automatically selected when the roofing 
filter in the main receiver is picked?

I couldn't find any menu that lets me program the filters in 
the KRX3, so I assume when the main is on the sub is on?? If 
it is in the manual, where is it??

Is there a way to change the tuning speed of the clarifier 
without affecting the main dial?

I found everything else, but never did find an answer to 
these questions.

Thanks, Tom