I just got Logic Pro X. First order of business was figuring out how to make a good harpsichord sound. Here's the stock version:
Here's the super modified version of the same sound, layered 6 times:
Techniques included making a track that had the equalizer emphasizing the very high frequencies of the twanginess, while I also slightly increased the attack and reverb on those to give it that nice harpsichord crispness. I also had different tracks emphasize different parts of the instrument to help "widen" its sound to make it sound more like it's right in front of you.
That's the same track of me playing, so the midi output files are identical in each.
Oh, and both recordings are in a well-temperament. Also... This still doesn't sound as good as it does right in logic, so I'll have to figure out how to up the quality.