The Altered Chord in Jazz is many times over used and unclear as to which notes are being altered. I think it’s good to be as specific as possible with harmony. As a horn player you should know the differences between b9 chords and #9 chords. More over, you should be able to hear all the differences between these sounds and then improvise with them. Try singing them first with a piano or guitar (or any chordal instrument) then start applying these sounds to ii-V-I’s and work them into your language. Hope this is helpful! Enjoy.