First of all... It isn't the nomenclature of MotifXS terms that need to be changed. It is the way they WORK. As long as a button performs the FUNCTION of a fill, I don't give a damn what it is called! But on MotifXS, even the loops which are programmed to be fills cannot be dropped into in realtime. In other words, when you want a fill, you have to cue it up a bar ahead of time.. You can't just drop into it and it be in sync with what is already going on. Plus there are no 'play this loop once, then go to this other loop' commands, which would serve as Intro loops, and no 'play this loop once and stop' which would serve as an ending.

Other than that, functionality is quite similar in many ways, and with the right content could be very arranger-like in many ways. Plus, of course, for your $1800 LESS than a Tyros you get tempo synchronized audio loops, a full featured sampler, multitrack DAW features, digital connectivity, Cubase integration, and a sound palette, especially drums, that blows the Tyros away. SA2, Mega and Live! sounds that you are familiar with, and an effects architecture that puts the T3 to shame. No harmonizer though (yippee!)...

And, of course, a choice of 61, 76 AND 88 keys. Something for everyone.

Kids aren't nearly as dumb as you think they are. Can't say the same for us, I'm afraid...
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An arranger is just a tool. What matters is what you build with it..!