Sometimes, when a note sounds "off", I will fire up the tuner to test whether I am hitting the note right on, slightly flat or sharp. I have noticed, not for the first time, that slightly sharp doesn't always offend my ears as much as slightly flat does. I notice when I forget to kick the third valve slide on D, but I don't notice when I start C a little sharp. Can anyone explain that, or do I just need more ear training. I have only been at this a month, after 20 years, so I may just need to keep working on it, along with everything else.