Let's recap a bit, shall we?

1. The Yamaha styles are 90% about effects. Don't believe me? Go listen again to the effects demo on your very own arranger where Yamaha themselves demonstrate this clearly & even bragging about it.

2. The PSR up to S975 is limited to the type and number of effects that can be used by it's internal style engine. So apart from the new voices, this is why the SX900 & Genos sound so much better.

3. Groovyband Live! developed a way to replace the style engine totally with software. The results are then driven through midi to the PSR which allows many more effects to be used.

4. They perfected this along with a intuitive interface which allows advance editing not previously possible.

5. They seamlessly apply the next OTS settings allowing the current settings to first play out in full.

6. They included 8 variations, 8 fills to & from, two breaks and 8 OTS's which follow the correct variation exactly as per Yamaha.

7. They included the registration function exactly as Yamaha.

8. They move the split point continuously to just above the chords you play giving your more room for your solo performances.

9. They allow 3 RH voices plus 1 LH voice, same as the Genos/SX900

10. The velocity of played notes can be randomized to varying degrees of "humanization"

11. Same Beat Reset function as per the newer Yamaha's.

12. Half bar fills.

13. Round Robin drums like the Genos adding humanization to the drums too.

14. Every L/R voice can have its own independent harmony settings. All the L/R voices can be configured as R (R1÷4). You can therefore build quartets of different instruments, each one playing possibly different harmonized notes.

There are more, I am still finding them