I think you are confusing Logic's new 64 bit memory processing with the audio engine which, to the best of my knowledge has always (for several versions anyway) and still does run at 32 bits internally.
What I think that Les was saying is that he knew that the Logic Audio engine had used 64-bit precision math where advantageous, which is true. And I'm guessing that what you meant to say is that you too knew that the audio engine processing used 64-bit precision math where appropriate.
I thought that in terms of actual audio processing, Logic ran (and still runs) at 32 bits internally.
Remember when we used to freeze tracks in Logic 7 and the resultant files were 32 bit files? I thought this was the internal resolution that Logic's audio engine worked at. But I'll be the first to admit, I'm no math expert
Logic's audio engine (as is the case for most other DAWs) is 32bit float
Are there any DAWs with a 64bit audio engine? Would it make an audible difference? ProTools HD (not LE or MPowered) uses a 48bit fixed (not float) system.
So you can see that measuring two different things in "bits" has a very different result:
--For memory addressing, each additional bit DOUBLES the total amount of addressable memory.
--For audio engine, each additional bit adds 6dB of dynamic range
This all makes perfect sense. But I don't quite understand how the "64 bit precision math" Orren explains fits in to all of this. This seems to be a third type of measurement.
I've enjoyed this thread, but that math stuff....