I've just spent the morning playing Horns Vol 2 and I have to say the samples sound absolutely great and what you've done with the programming is amazing. I'm not sure how much work this is, but any chance you could do what you did with the basses and allow left-hand playing with the trombones and bari saxes, i.e. swap the note and keyswitching ranges? I prefer keeping instruments on their correct range on the keyboard and putting the keyswitches somewhere else out of range. (Ok, I really just can't get my right hand to learn left hand parts :>)
Also, I suspect it may be Kontact and not you, but when you switch presets on the relax page I get a big pop on (only) the first note.