My very first MIDI software arrived with my ATARI ST

I eventually got a 100MB harddrive which cost nearly £100, connected via SCSII

Editing Software for the SW60

http://wdrouin.free.fr/Mu128site/XGediteur/editeur.htm

Editing software for the SW1000

http://wdrouin.free.fr/Mu128site/XGediteur/editeur.htm

Cubasis is handy if you want to access an old .ALL or .ARR file. It still runs on a win7 64bit system (in 32bit mode of course)