for example the use of multiple midi busses for timing critical application - totally obvious, but one easily forgets about it...
exactly as you said Astro

makes me overthink my cheaper RME 9636 card solution for my double mac setup.
The RME 9652 has double Midi...
But then again my Pulsar, to be put in the OS9 mac, only offers one port...
a bit OT, but last week
Electron, the makers of Machinedrum (UW) and Monomachine, presented the TurboMIDI TM-1 USB interface.
If you ordered the Machinedrum UW (sample load option) last week, you get it for free.
I expect the MD Tuesday
This is what they emailed all 'Elektron Frieds':
The TM-1 improves the bandwidth between your Machinedrum or Monomachine
and popular home computers with up to 10x the original MIDI speed! The
increased speed improve timing and bandwidth to modern standards.
For example, at 10x speed, the MIDI clock can be 10x tighter and 10x more
note data can be passed though at one particular time. All MIDI timing
becomes more accurate. This is especially valid for Mac OSX users.
Increasing the bandwidth also makes sample transfers (or OS upgrades!) a
much more delightful experience.
You can use any sequencer or other application together with the TM-1. To
engage TurboMIDI-mode, just Press the Button! MIDI is a great as it is the
universally accepted standard. TurboMIDI is a compatible evolution made
possible from improved modern hardware.
Instead of releasing new version of our Machines with USB ports, the TM-1
now virtually transforms your MIDI ports into USB. Anyone who wants this
improvement can go TurboMIDI can now do so without the usual need of
selling and buying new.
Our tests has shown that at least 80% of all MD's/Mono's reach 10x speed,
and 20% 8x speed. This will be graphically explained in the upcoming
TurboMIDI story.