Yep...remember the Casio VL-1...better known as the VL Tone?

http://en.wikipedia.org/wiki/Casio_VL-1

Calculator or pro instrument?

Neither the E-50 or 3k have calculator functions...too bad...you could add up your tips, or work out your monthly payments.

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