Unitor 8 Mk2 Advice...

Hi,
Long time Unitor 8Mk2 user, with a few questions:
1. Can the Unitor take advantage of AMT (Active Midi Timing) in OSX, (or was this an OS9 feature only)?
2. Any ideas if the Unitor will be 64 Bit compatible now or in the future, & are the current 2.5 Unitor Drivers compatible with Mountain Lion?
3. I've read the Motu Midi Express is a lot tighter than the Unitor 8 - any Motu users care to chime in. (I know the Motus are USB2, compared to the Unitors USB1, but if you've a lot of USB2 connected, this could possibly negate any USB speed advantage - especially as the Unitor has it's own power supply).
4. I've also read that PCI-e audio cards (with a midi connection) are the tightest midi solution of all. The audio side would be redundant, as I'm already using Apogees, but could I run such a card alongside a Unitor?
All of the above might seem like overkill, but midi is very important to me - particularly for syncing my MPC3000. (I also have a lot hardware synths).
Any advice would greatly appreciated...
Thanks!

CoreAudio has always been using AMT on OSX. And it's not just about daisy-chained devices, a single device can already have significant delays between the channels.
Unlike audio, midi is not locked to a clock source but simply transmitted when available. The time stamped processing of AMT (or other similar systems) introduces a clock that makes sure that processing buffer granulation in audio hosts or scheduler time slices don't create timing jitter.
This is why midi timestamping is essential for all modern DAW midi use. The default CoreMidi compliant USB driver even supports time stamping. But it's not realized in hardware but at a low granularity kernel level directly before the data goes out over USB.
So these days midi timing is not as good as it could be, but time stamping is highly relevant for getting good results, *because* of the issues introduced by other parts of the system.

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