 In February 2006, Austin recorded "Rex (Live at the Fillmore)", a live album under the band name Grateful Grass featuring fellow musicians Keller Williams and Keith Moseley (The String Cheese Incident).Available only for digital download, the album features non-traditional bluegrass versions of songs by the Grateful Dead with 100% of the proceeds going to the Rex Foundation.In 2010, he partnered with Brendan Bayliss of Umphrey's McGee to form a group called 30db.