Learning from Mistakes
It's really the most effective way, in my experience. The errors of the past are the things that stick in your memory and typically bring about the most change. This particular episode was my very simple and ostensibly easy Guitar Scales assignment 3 this week. I thought I'd be clever and convert the sheet music over to Sibelius and then import that into Guitar Pro so I could practice along with it before recording myself playing the assignment.
The problem was that I didn't proofread it, probably because I was in a hurry and it's a pretty simple piece of music that I honestly didn't think Sibelius (via Photoscore) would screw up. Well, I was wrong. Got a B- on the assignment because I played it wrong - the imported version got several note values and positions wrong. I'm not sure what the instructor really thought, as he just commented that I had played the wrong note values. It almost sounded like he thought I had just performed them out of time. Regardless, the grade was fair because I failed to play what was on the sheet. I can just imagine the tone of a professor in a more rigid program a la Julliard or the resident Berklee classes.
I frankly think he was diplomatic about the whole thing. I'm going to re-record it and submit, although I'm not sure he'll change my grade. I'll explain that it was my error for not proofreading and see how far that gets me. Lesson learned - never assume these technical tools can't make mistakes. Which, I normally don't, but when you're in a hurry it's easy to make stupid errors like this.