Hello Fredy,
Two thoughts spring to my mind on this problem. Before you start, save all your settings to floppy or SD Card for safekeeping.
1) Make sure you are working in the 'EXPAND' mode as this ensures TOTAL SETTINGS are stored, whereas 'NORMAL' mode only stores Sound and Balance settings. If you are in NORMAL mode this could be the cause of your problem. In case you don't know how to check the mode you are in:-
Press and hold down the BLUE BUTTON in centre of the panel memories wheel. The screen will change and you will see a red box around either EXPAND or NORMAL. If it's around the NORMAL just press the button alongside the 'EXPAND' which will then have the red box around it. Press Exit and you are now in the mode to save ALL settings.
There are two pages to this screen and on page 2 you can do other things which are self explanatory, so I wont go there.
2) Having said all that, it could be something simple like the ORCHESTRATOR, SOLO or EASY RECORD being used which would affect the Technicord. e.g. Solo Trumpet obviously would not need added notes, so this would be one area where the Technicord would not be operating.
If you have the book "TECHNICS SX-KN700 OPERATING INSTRUCTIONS", the Techni-chord is covered on Page 48.
Hope this is of some help. Good luck
Audrey