bbc,
have you tried the SRX 11 inside the G-70? How does it sound? And, since you spoke of "effects of the host keyboard", how are the internal effects of the G-70? Do they allow you to tweak a sound, like the "Superior Grand" the way you could in a dedicated synthesizer like the Fantom X?
I am asking this because in my VA7 the effect processor was the real weak spot of the keyboard, to the point that I bought an external unit (TC electronic M-One XL) to have a better sound; I hope that Roland improved this in the G-70.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.