I started to play on my new KN7000 3 months ago because I have bought him as a new one. I know that the lyrics and score are a part of SMF format - previously I used the Yamaha 2000 keyboard with songs provided with XG format - and harmony effects (echo, duet,
trio-for microphone), lyrics and score were very simple applicable through buttons.
Could somebody recommend me some SW for insertion of lyrics to files?
I know the equipment produced by company DigiTech for harmony effects, but
before I buy it, I have to be sure that my KN doesn't contain these functions.
I shall be obliged you for any information or links to people who can help
me.

Hi,
unfortunately I'm not much help on either matter, but your kn does play midifiles. so you should have access to your lyrics as a midifile. Try pressing the following buttons.
disk
direct play
start
lyrics
Maybe it can be done in sequencer too, but if so, I'm not sure how.
As for harmonizers, have you also tried posting the question to the general arranger synthzone forum. Hopefully someone may help you there if no one here can.
best wishes
Rikki