As both a Yamaha PSR2000 owner and former Technics KN5000 owner who has had the opportunity to play the KN7000 as well, I can confidently say you should have NO PROBLEM catching on to the KN7000 OS system. I believe both the Technics & Yamaha OS to be the most user friendly of all arrangers, so if you have managed to catch on to the Yamaha's floppy disk & user memory system, the SD Card system will be just as easy to master.

Zuki, the big strength (imho) about the KN keyboards is its user friendly & powerful on board sequencing & editing capabilities. I especially like the way you can step record/edit arranger parts into the dedicated control track. Yamaha unfortunately doesn't include this feature.

Though it certainly will make things more convenient if you utilize a computer, you can certainly get by quite nicely doing everything you want directly on the KN7000 itself, WITHOUT a computer.

Scott