Some clarifications:
The midi buffer size per VEPro plugin was 127 in Logic 10.0.X (and anything before it). It was increased to 511 events in Logic 10.1.
This buffer applies per process block. VE Pro uses a midi buffer size of 16384 events per block (per plugin/instance).
We have now released 3 iterations of the Multiport environment. The first version multiplied MIDI traffic by 3. The second version (combined with a later VEPro version) cut this down to 2. The last release keeps the multiplier at 2, but slightly simplifies the environment layout.
The history of maximum numer of MIDI events in Logic has thus been:
Logic 10.0 + Multiport 1 = 42 events per block
Logic 10.0 + Multiport 2/3 = 127/2 = 63 events per block
Logic 10.1 + Multiport 2/3 = 511/2 = 255 events per block
IE, your arrangement can now be 6x more bombastic than when using the first multiport version with Logic 10.0.