Hi Jerry,
unfortunately I don't own a kn at the moment, and I've never owned a kn1400.
If you have your manual , look up the midi section.
Main thing is to connect your midi cable, midi out from the kn to midi in on your Boss module.
I'm not sure what the options are on the kn1400, but there used to be 2 main pages

1. Where the KN was the master ie it sends out the information to another instrument, or computer.
May also have the option of having APC on or off.


2. Where the kn is the slave ie the kn acts like a sound module when using a computer or another keyboard. ( This is NOT the option you require)

Unfortunately it may just be a case of trial & error.

Sorry I'm not much help, without a manual it's hard to know what to do.

best wishes
rikki