Hi,
Is'nt it mostly Hammond Organ sounds on the album you mention? Then you can check the B3 V2.
I think the relevant players also use Minimoog and Oberheim synths, but i don't know, if they are used on that album. But if they are used, then you can check the Mini V3 and OB-Xa V.
I don't think you shall exspect to find presets named after Rainbow songs or refere to Rainbow. But It's still possible to find presets you can use or create them yourself.
