Thank you for fast answer.
But based on your answer, a new questions raised on my mind.
I don´t know if I understand it right: Do I need my computer with appropriate mixing software (which allows redirecting channels) together with LP-16 physically at the concert ? Because if yes, then the LP-16 do just the same task as a mixer.
Or it is enough for me to have (at live performance) only LP-16 and some data traveler (for example flash disk) ? And there are prepared saved instructions (made at home) in LP-16 to which WAV should play in given song in given output ? So I don´t need to have physically device with appropriate software at the concert ?