On the G and A above the staff I've been using alternate fingerings to bring the pitch down a bit. On the G I will use 1 and 3 and pull out the tuning slides while on the A I will use 3 and pull the tuning slide out just a tad most of the time.
The G is the main culprit here.. without lipping it down with the normal fingering I sometimes get a tone as much as 30 cents sharp!
I've noticed that these alternate fingerings, while good for getting in-tune, mess with the integrity of the timbre a bit. I don't seem to get as good a sound out of them as I would with the normal fingerings. It's a very slight difference in sound but a difference none the less.
Is this just because I haven't integrated using these fingerings into my playing or is it specific to the trumpet? Should I just lip them down or use the alternate fingerings?