Heya Will, welcome back to the Amiga community. You're right, the first thing you should do is see if the A1200 still works! If the hard drive is dead it shouldn't be too much of a problem, at least it's not too hard to get a copy of Workbench and all your old favourite software again, installed on a fresh new CF card instead of a clunky old HDD perhaps. Have a look for your A500 while you're at it, there's plenty of fun you can have with both old systems set up again.
I don't know much about music production though so I'll leave that to the other guys with more expertise in the field.
Good luck with everything, and I hope you get plenty of use and enjoyment again from your Amigas again!
