Erick Kvist created the MSLP library with something like 15,000 samples. Among the instruments was this fine Trombone. It has over 600 samples including a nice sustain with either two or three velocity layers and almost every note sampled. The ff layer is kind of extreme so I created a mild sustain and a regular sustain. It also has staccato with 5 round robin and three velocity layers along with gliss, swells and flutter.
I reworked it a bit and added in a newer GUI so hopefully it sounds a touch smoother and looks a touch better.