I would like to use some rhythms from CTK-900 in CTK-7000. I have recorded them in MIDI format, but in drum tracks there are some strange notes like F9, Fis9, C10, Cis10, D10, F10, Fis10. These keys don't exist on CTK-7000 and these notes even cannot be played on my computer - they produce no sound. What should these notes mean? Can me somebody help with them?