Chicago trombonist Jeb Bishop doesn't need to blurt, though he can do it with the best of them, as evidenced on his Jeb Bishop Trio (Okkadisk) recording. On it, he, drummer Tim Mulvenna and bassist Kent Kessler create beautiful, spacious free jazz. Bishop can murmur and mumble on his instrument, and when he cuts loose to improvise, he gracefully moves from frantic to fuzzy.
If you know of Bishop, chances are it's from his association with Tortoise, Stereolab, Jim O'Rourke, Gastr Del Sol, Ken Vandermark (Bishop's a member of the Ken Vandermark Five) or Peter Brotzman (he's a member of Brotzman's Octet and Tentet). Lots of activity, quite worthy of your attention.