Logic Pro 9 producing GM general midi files

I don't think there's any magic answer. Get yourself a good sounding General MIDI sound module. Program up your parts. Make sure to normalize all region parameters and consolidate all the regions on each track. And then export as standard MIDI file from the Export menu under the Global File menu.
 
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Certainly you can do all the programming in Logic using software instruments.

But, my understanding of General MIDI is that it also needs to include bank and program change messages. I'm not certain about that though.

If you did need to include program changes that's easy enough to do. Just download a general midi patch list to get the program change numbers and then insert them into your regions where necessary before exporting.
 
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To insert program changes n the Event List just press on the Create button in the upper left corner, and then click on the "Progr.Change" button in the row underneath it.

But what are you using a sound source? Logic's internal software instruments don't respond to program changes. Putting these events in the MIDI regions on tracks assigned to internal Logic instruments will have no effect.

Unless you are programming "Performance" changes - but that's a whole other story involving Channel Strip Settings and is getting off topic from your original question. There is another thread running on this forum currently about using MIDI program changes for that. But it's got nothing to do with programming GM files.
 
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