Right - having dived over to my KN7000 and checked this one out - tell me if I'm wrong Alec but I believe it to be as follows...
Press and hold the Panel Memory set button in the centre of the circle and then access page 2 - don't forget to press 'display hold' after that or the screen will return to default position.
On this page select appropriate filter types to the 'on' position so that previous files used do not influence the new file loaded.
I guess the next step is to ensure that this status remains 'quo' so to speak which if I remember correctly you can do by adjusting the 'data protection' detail which you'll find when you press the customise button - among the next set of 3 buttons to the right of panel memory...phew...
Rog