According to the E-50 manual...

"press the [INTRO] button (so that it lights), one of the VARIATION [1]~[4] buttons to select the “complexity” of
the introduction."

So the buttons are there...it just takes TWO button presses to access the intros...the 3k needs only ONE press.

The E-50 has similar operations for the endings...TWO button presses as opposed to the 3k's ONE.

Transposer on the E-50 requires TWO operations...one to activate the display/menu, another to choose the key...the PSR-3000 need only ONE.

So the E-50 has slightly more complex operations than the 3k...I guess it depends if you can live with them...or not.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.