Hi Audrey,
Sorry to read of your problems with the T4.
I have kept coming across bits that you have posted both here & on YPKO and followed them (along with those of many others) with great interest because I have also ordered a T4 (expect it in around 2 weeks).

Like you, I have a Technics KN7000 and then bought a Tyros 3 and, like you, I also had quite a hard learning curve with the T3 but have managed to suss out just about everything I need to know.

My KN7000 is still my favourite keyboard and looks like holding that position forever. It's operating system makes Yamaha's look as though it was knocked up in 5 minutes without any real thought at all. I should stress that my purchase of a Tyros was only insurance for if my Technics dies on me but a range topping keyboard should reasonably be expected to satisfy the buyer in most ways - up until now, my T3 has failed this test.

As I have not been totally happy with the T3, I was undecided whether to move onto the T4 but thought it's got everything the T3 has and then some extras so it must be a bit better. Having taken the plunge, I now find myself filled with dread at this move and this is not allayed by the fact that most of the Yamaha fans seem to think it's normal to have to mess around with so many settings just to do something which the KN7 did straight out of the box.

I sympathise with your problems and hope & pray I don't suffer the same because I've found that the quickest way to become unpopular with the Yamaha fans is to post anything other than praise when discussing a Tyros.

What can I say except that the KN7000 is still King and why, oh why, did life have to be so cruel to us devoted Technics lovers.
Tony