Which Toto? Early 80's(Rosanna, Africa) or late 80's-early 90's Toto? Just get the best studio players in your country and make a band!!! Basically that was Toto in a nutshell. They had a lot of great engineers at different times. George Massenburg did one of their albums(it was one of their last one's). I think Elliot Scheiner did a couple(I could be wrong on this one) and also Al Schmidt. I liked the early Toto best(to me the songs were better), but at that time they were one of the most ripped apart bands(they were a rock critics dream band to rip, everything wrong with pop/rock they said. Too mechanical, too perfect. Sounds like they were describing Protools to me). They inspired a slew of studio player type bands(Mr. Mister, Level 42, and others). Good luck on this one...you will need it.

Love TOTO, I know that the keyboards are combinations of analog synths and samplers used together, Like a Roland sampler for the initial attack and an Oberhiem to carry the tone. Don't know if a sample will give the same effect on it's own, maybe a sound font will.
--Rick