Sorry for taking so long to get back to you. I forgot about your post and it is difficult to navigate through the roland forum. I have had so much trouble with this issue and have found very little help. I have even had two guys that are very familiar with music production come out to help me with no avail. However I have figured out how to sync the fg with pro tools.
With my fantom g I am using a mbox2 and Protools 8. Don't sweat it I know that you are using a mbox mini and I will go over that. Hopefully these are easy instruction but it not just reply with questions.
1.Download the Fantom G Drivers to your computer. If you do not do this pt will not recognize the fg.
2.Since you are using a Mbox Mini you do not have to have midi cables like you first thought. Connect your fg to your computer with an A to B usb cable (the one that printers use). If you look on the top right of your fantom there is a slot labeled computer. This is where you connect the usb cable.
3.Connect your Mbox Mini to your computer into another usb port. You must have this connected for protools to work.
4.Open up protools and turn on your fg.
5.When pts opens up go to Setup then Midi then Midi Studio Setup.Create a new insturment. Make the Roland Fantom your new insturment. On Input Port select your Mbox and on Output select Mbox Emulated.
6.Next setup your Ins and Outs by going to Setup I/O setup.Go to Output, since this is Midi select mono next to Out 1-2 and check 1 (a M with appear) go to Input and and do the same thing. Then click OK
7.Amost Done. Now go to your FG and Push Menu then Go to System. Go to Sync/Tempo then Sync Mode and set to SLAVE-MIDI. Set Sync Output to off,Clock SOurce to Midi, MMc Mode to Slave and MMC output to off. Everything else leave alone. Click Sys Write and you are done!
If you have done this right then when you open a Midi track in pts and arm the Record then push a note on the fg the level in pts will rise.
This is just how to use the FG as a controller. I am still trying to figure out how to use it as a sound source. If you figure this out let me know. I'm sure with some playing around I'll figure it out.