You need some sort of interface and a computer in between first.
You have to record them yourself.
Cubase 5 is no longer sold or produced due to the release of the newer Cubase 6 and Cubase 7. These newer versions of the software retail for $400 each.
A few gigabytes
Nope, It's Just For Editing Mucic Acutasicy
Yes, if keep your plug-ins to a reasonable level, it is enough.
It's an audio sequencer.
Yes, you need a cable for your keyboard, usually a MIDI.
Select the GuitarPort ASIO drivers in the VST Multitrack section of the Device Setup menu.
You can get Cubase from Steinbergs website
On the Cubase Wiki, you can find information about Cubase software features, updates, tutorials, troubleshooting tips, and user guides.
You plug it into the wall, plug your lead into the input and plug the other end of the lead into the input jack in your guitar.
You can plug a guitar into a computer by using an audio interface or a USB guitar cable. Connect the guitar to the interface or cable, then plug it into the computer's USB port. You may need to adjust the computer's audio settings to recognize the guitar input.