BT Talks about MIDI timing inaccuracies...
I don't see a date, but that article is at least five years old ("On Saturday, August 10, 2002, BT will be playing at..."). PDC wasn't common (iirc) and hosts weren't nearly so flexible about timing issues as they are today (and it sounds like the new External Device plugin will make this even better in Live.). I mean, MIDI is an ancient creaky protocol, but it sounds like the issues he's talking about are timing issues that can be compensated for these days without too much trouble.