Hello Bernie
Not sure about the KN7000 but master mode on most keyboards, separates the actual keyboard from all the KN7000 sounds, which means they will only play via midi.
I am not sure what knowledge you have on Midi, but please remember the Midi cable does not carry Audio, (A common misunderstanding by new uses) so you will need to connect the audio output of the Receptor to your KN7000 or an external amp and speakers.
If the KN7000 is in Master mode then to hear the KN7000 sounds you will need to connect another Midi cable from the Receptor to the KN7000 Midi in.
Hope this helps.

Bill