The KR-770 and KR-570 share the same operating system, tone list and arranger styles. The main operational differences between the two units are:

Feature - - - - - - - - - - - KR-770 - - KR-570

Pitch-bend wheel - - - - - - yes - - - - - no
Expression pedal input - - - yes - - - - - no
Total speakers - - - - - - - - 6 - - - - - 4
Output power in watts - - - 60 x 2 - - - 40 x 2
Tone groups - - - - - - - - - 8 - - - - - - 8
Variations - - - - - - - - - - 136 - - - - - 124