The G70 V3 OS adds some VERY significant improvements in OOTB sound of the G70, plus a fix for the OTS system that makes it now just about perfect (functionally, even if you disagree with the factory choices). The OTS is now linked to the Style, NOT the UPS and Custom styles. And works for Internal AND Externally stored Styles.
Plus you now have a 3 band parametric EQ on each and every Part (Style, Keyboard AND SMF) and the same EQ for each and every drum within the chosen Drumkit. So now you can make the G70 sound almost any way you want.
Add in a few more OS improvements (Break/Mute to Footswitch or FC-7, for instance) and it adds up to a VERY worthy addition to the G70. Even so-called 'closed' system arrangers sometimes get OS improvements that almost turn them into new arrangers.....
A huge improvement....... check it out for yourself.