iolli

Or is there a way to embed a Max patch into the MIDI FX bus of a Midi track in Logic?

Or is there a way to "convert" a Max patch into JavaScript and use it with the MIDI FX Scripter?

max-4-logic-pro-x

You can do this using IAC. Max creates its own virtual MIDI ports and you could send MIDI data to Max from Logic, let Max process it and then send it back.

Max 4 Logic Pro X