The MIDI settings are totally irrelevant, they're just there because Max/MSP takes MIDI input, and exporting a Max patch as an executable really just means wrapping the Max/MSP engine itself. That's why if you explore the files of the executable, you'll find a bunch of assets that aren't used (these come stock with Max). That said, I probably should have done some "optimization" involving deleting any unneeded assets from the executable, that would quite likely cut down the file size significantly. As for the MIDI...well...we'll see if I can think of any ideas for that. ;)