Differences between PSR630 and PSR730

The PSR630 and 730 are very similar instruments. While they both have the same Owner's Manual, there are a few major differences:

FEATURE	DESCRIPTION	PSR730	PSR630
Polyphony	Polyphony is a measure of how many notes can be played at once. This is critical when the player is composing complicated orchestrations with many parts/instruments.	64-note polyphony	32-note polyphony
Groove and Dynamics	This allows a player to change preset internal or custom styles that affect the rhythmic and dynamic feel of a style.	Yes	No
Multi Effect	This feature is essentially an assignable and stackable effect processor. For example, the player can assign a HALL REVERB and ROTARY SPEAKER to an R1 voice. The R1 voice can be any instrument.	Yes	No
Modulation Wheel	This wheel adds variation to a chosen instrument sound. This variation can be either a low frequency oscillation, brightness, or resonance.	Yes	No
Master EQ	This feature adds a 5-band equalizer that affects the overall sound of the instrument. There are preset equalizer settings available from the PSR730 panel. These settings are programmable from the panel or through MIDI.	Yes	No

Reference: Owner's Manual, p.2-3