Can I arrange music from my computer, then export it to another computer in a different town, where my friend could open the file and add vocals?

Yes, well depending on the file size.

There are a few ways to do this.

Here's the first way:

-Save your project to your desktop.

-Open your email, and compose a new message.

-Attach the file you saved on your desktop

-Send the message to the person you want to keep editing it.

He(she) should be able to open it, (if he has Music Maker of corse) and keep on editing it.

The second way is to save it to a external disk, (CD, SD Card, Flashdrive, ect...) and send it to him(her) also

Hope this helps!

Good Luck!

-Andy Cope