Wersi has been offering sound upgrades for all their instruments since longer than the Tyros line existed. They've also offered hardware and software upgrades so users like myself and Abacus didn't have to ditch our instrument for the next new fangled offering. I seriously doubt the Tyros Vintage Synthesizers Pack Rivals the Kronos sounds. I'd also venture a guess that the Motif has many of the same sounds of vintage synthesizers on board because Yamaha uses their sound libraries on cross platforms. One things for sure, the synthesizer sounds I've heard on the T4 certainly don't compare to any of my vintage synths nor can it. You're trying to make an Apple be an Orange and that's just never going to happen.
Of course your idea of what sounds good (or authentic) is your own
personal opinion, as keyboard sounds are very
subjective, and what sounds good to one, may sound less than stellar to another.
Can you please provide some demos (played by you if you are up to it) of the vintage synth sounds in YOUR Wersi?
I, and no doubt, several others, would love to hear them and form our own opinions.
Ian
PS...what model Wersi do you have?