If you have limited space on your Mac drive, you can install the RealTracks files on an external hard drive by selecting custom install locations, and it sounds like you did that. I'm not sure I understand your question completely but all Band-in-a-Box related installer packages (Xtra styles included) will use the same install locations. It is also fine to install the entire Band-in-a-Box program onto an external drive, and run it from there. That is also the least complicated way to do it, since you don't have to worry about specifying custom locations for your RealTracks and Drums folder within the Band-in-a-Box program. If you decide to go that route and you have already done the 'split' install, you don't need to reinstall everything, you just need to copy the /Applications/Band-in-a-Box folder from your Mac drive to the external drive. Let us know if you need further help with it

Andrew
PG Music Inc.