Hey NightWing, thanks heaps!!

I did try to learn how to convert tune notation to ABC but I was a bit confused.

The MIDI file needs to be converted in the *listeners' brains* into a growly, deep, electric bass with attitude. It sounds too sweet and pretty in the treble clef. :-D

As I said above, the first four bars are repeated, then four more bars are repeated, but in the second variation the notes run up through the chord notes from the low to high note. I'll have a go at doing it in ABC but I seriously suspect it might be a while before the mystery song is identified.