I believe the demos are short files, to show you what the style is like. I'm not sure that they are downloaded, when you preview them.. Strictly speaking they are not necessary, just a nice way of showing you what it might sound like.. It does not play your song.. just an example.

Using this feature forces BIAB to 'phone home' every time you audition a style.. It's just as easy to hit the play b button at the bottom of the box and hear what it is going to do with your song.. .

If they are downloaded, they could take up space on your drive... Luckily BIAB does not force us to run BIAB off the system drive. More users are getting small SSD for system drives and slower much larger drives for libraries, songs. etc.. The problem is SSD are so expensive, people are trying to get by with 120 gig or 250.gb for the system, so it runs fast.. Unfortunately with Mac, they force you to have a lot of files on the system drive to operate the application.

I am forever searching for data to move or toss off system drive to keep it running smoothly.. there is a program called 'sumbolic linker'. Which makes the system drive think data is on the OS X drive, while in reality, it is on a much larger drive somewhere else.. This is all on a Mac, I'm talking about..It's a pain cause the system drive needs about 25% of empty space to run smoothly.. A one Gig SSD drive is about $800 = Way too expensive..

Don't know how a regular PC deals with this. But kudos to PG music for making the BIAB portable, so it does not have to be installed on System drive to work.. Now if only a lot of other manufactores would do this..

Mark Styles