Hello Scott, thanks for your interest. The truth is that S970 and S770 are excellent keyboards. I have the S770 due to a small financial crisis that forced me to sell my previous S970. the S770 and S970 share part sounds and preset styles (not all) the S970, has string sounds inherited from the Tyros 5 (RealString, BallRomStrings, TheaterStrings, BalladSting, LushStrings, to mention a few) the same happens in the brass section, which comes with different nuances and dynamics of French Horn. in the Electric and Acoustic Bass section there are super articulation sounds! that make the effect of glissando of the instrument. in the chorus and pad section, there are sounds and textures (BoysChoirOoh, BoysChoirAah, BoysChoirOhAh, Randomizer, The Fog, Spectralis, Metallic Rain, Ambient Theme, Spectrum Pad, and more) there are also the audio styles, the vocal harmonizer VH2, and the DSP effects also inherited from the Tyros 5. these voices and effects are not in the S770, and are very important when creating a serious musical arrangement (Classic, Epic or Environmental, Alternative). In any case, the S770 is a very good keyboard with what it already has. in fact I have already created several musical arrangements on the S770, for several friends who sing, and have congratulated me on the excellent sound quality. if at this moment I had the economic solvency, I would go for the Genos, just for the fact of having all the whistles and flutes of the flagship. But I already said it in a previous post. I will enjoy my S770, until I have enough money to move to the top model (S975, Sxx, Genos light, or whatever ...) at the moment I have a lot of fun aboard the S770. The other thing is your question with regard to the reproduction of a similar sound (especially strings, brass and bass) in S970 / S770 through the speakers. my perception is that you hear more resonance and body in the S970. this is due to the four speakers (two of 13 cm and two domes of 2.5 cm) that offers brightness and very pleasant means, with deep basses. In the S770, the perception of sound is rather moderate, but pleasant. I hope this helps clear some doubts about both keyboard models. Greetings. Hans