Hi Tangmo,
I remember recording that guitar part for you but don't remember the song, too many years ago! I do however own the CD that it ended up on, I'll need to pull it out and give it a spin soon

Misha,
I prefer going forward with new songs, that is the fun part for me. But sometimes I will revisit older songs and tweak the mix.
One of the disadvantages I have found with doing everything from writing, performing, producing and then mixing and mastering the song yourself is you tend to get too close to the project, can't see the forest for the trees sort of thing. And then when you listen back a few weeks after the fact you might hear things that you missed the first time around.