Playback sounds: change attack on brass

Is there a way to change the attack on playback of trombones? There is almost no discernible attack, so they always sound late. The same is true for trumpets to maybe a slightly lesser degree. For trombones, in the Track Inspector > Routing, I’ve got HALion Sonic, and Iconica Sketch Tbn, Hns under Ex. map. I’m somewhat new to Dorico and have learned a lot about note input and writing but very little about the sounds available and how to manipulate them.