Having played the T4 for a few days, I can only echo what Donny said - you can pretty much do it all with the S-950, plus have the benefits of a smaller, lighter package. The OS is pretty much the same on all Yamaha MOTL and TOTL arrangers. The sliders are still there on the S-950, but they are electronic instead of manual. Personally, I've never used the sliders, even on keyboards that did have manual sliders. Just never felt the need. I always set them at max volume and left them there.

All the other features, MFD, registrations, etc..., are identical. If you have a problem, one that you cannot solve, just email me your telephone number and I'll try to walk you through the problem over the phone - it's usually much faster and easier that way.

Good luck,

Gary