To further clarify my point, the video demo that impressed me most was the first one, entitled "G 70 new tones", and especially the part where the demonstrator plays "Georgia on my mind" with an Alto Sax sound for the right hand and an Electric Guitar sound for the left hand: no styles at all, just plain sounds!
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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.