I know that Logic is 64 bit as far as VI's are concerned. I have always used the Vienna Symphonic Library (32 bit samples) with EXSII in Logic 7.2.3. I do not think the samples sound the same in Logic X. Does that make any sense, is also the bit-depth of samples affected by LogicX's64 bit architecture. Mind you everything plays, it's just that they sound different (I sometimes have the impression that there is an octave of difference!) Cheers, Bob.