Here is what I find amazing comparing a 61 key keyboard with a 76 key keyboard:

The Yamaha Tyros 2 weighs in at 32 lbs without a hard disk. The Korg Pa2xpro with 76 keys weighs in at 39.68 lbs with a hard disk and a motorized display. A 5 lb difference. Both keyboards very lightweight considering the features they pack.

In the size category the Tyros is 44.8 inches wide while the Pa2xpro is 47.52 inches wide. A little under 2.5 inches difference between a 61 key keyboard and a 76 key keyboard. Don't forget the Korg has two keys and a Joystick placed in the same location as the Tyros 2!

The Pa2xpro is an amazing 14.37 inches deep compared to the Huge 17.7 inches of the Tyros 2.

Bottom line is that Korg has found a way to stuff a 76 keybed in a workstation without adding large amounts of size and weight.