Breaks most used application and devices

I was expecting to write a good review here after decide to take my chances on installing El Capitan in my brand new Mac Book Pro Retina. Well, the upgrade was successful but the surprises came when I tried to use my USB Audio device Fast Track Pro and also when I tried to open my so important Application Bible Study+ from Olive Tree. I am so disapointed and now I don’t know how to roll back from this bad experience I am having. Apple, what is happening to you? We could trust your quality controls and technology for so long and now you are launching OSess not compatible with so popular application and devices????

Alexandre_ about OS X El Capitan