I began composing the work around July 7th, 2014 and completed it around the end of that year. I edited the scores as they stood and didn't look at it again until around February. Then I re-edited these scores and found many areas of improvement. From here I extracted the parts and played through each of them on my euphonium. Through this process I found approximately 500 (yup) areas of improvement. The final step was to then input all of these into the parts as well as the score - even then others were exposed.
Finally, I printed the score and got it bound in May. I flipped through it and noticed there was an accidental missing in the Solo Euphonium part!! Such is the life...
It will be edited once more after it premieres. Until then an errata sheet is what will be used.
The editing never really stops - it just keeps improving.