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Have you tried using note numbers instead of note names? i.e note C1 = note number 36, C#1 = note number 37 etc.
Midi Note messages run from 0 to 127. The Event 4 software has the MIDI Note numbers as 1 – 128 so you will need to add 1.
See page 65 of the Event4 manual for a table of note numbers. I havn’t worked with custom MIDi strings coming out of the iLive but have worked with the standard midi messages sent/recieved by the iLive. Enttec’s new DMXIS software might be something worth looking at as it can learn Midi messages and will directly output DMX512 so you wouldn’t even need the Event 4.