In this rather long video I try to demonstrate all the features of the OB12. Both it's weak spots but also it's strength's.
In my mind, it's a really good synth, well laid out and can do epic sounds. It has a lot of features that not many synth have. At least on papper. Some things just don't work. If it's because of a weak CPU or badly writen firmware, I don't know. But I just stay away from those functions instead. Just don't expect it to sound like a OB-Xa or alike. Rightly tweaked this can still sound huge and fat, quiky and mean.