Keyboard Maestro sends MIDI packets, it does not have any support for routing them.
I tried this method, but the KM splits SysEx message into 3 parts:
for example: F0 00 00 66 10 12 90 64 7F F7
12:39:43.200 From Keyboard Maestro SysEx Loud Technologies / Mackie $6 bytes F0 00 00 66 10 12
12:39:43.200 From Keyboard Maestro Note On 1 $64 $7F
12:39:43.200 From Keyboard Maestro Invalid $1 bytes
The last invalid message byte is F7 - EOX
Thus the second message is intercepted by LPX and everything else is discarded as unreachable.
Maybe the "send raw packets" syntax should be somehow strictly defined for SysEx messages? Since the above behavior of KM when sending MIDI packets is very strange. Otherwise how to understand the logic of sending SysEx messages? Which must be a single sentence/phrase enclosed between F0 ... F7 according the rules of MIDI!