I have enjoyed reading about the many conversions from Electric to Upright. One reason for the appeal might be this. Pure intervals are based on exact ratios of the frequencies (e.g. 3:2 is a perfect fifth). The problem is that if you follow fifths through all twelve tones the resulting octave will not be a 2:1 octave. Old instruments based on this system only sounded good played certain ways. Western music has settled on equal temperance to solve this problem. That is, each half step is the exact same distance apart. This problem is that a modern day fifth is not quite a true perfect fifth. Unless you play upright! As an unkeyed and unfretted instrument, its player if free to use any interval that sounds good and is not limited to any fixed pitch (which is why position markers might be bad). Does the upright tap the well of Platonic perfection, satisfying the soul in the margins of musical perception?