Gump was drafted by the Phillies in the 26th round of the 2009 Draft and hit .239 as a minor leaguer, climbing as high as Clearwater, where he spent all of last season. Initially, Gump had been drafted by the New York Mets in the 46th round of the 2008 Draft, but didn't sign.
Feierabend has spent parts of three seasons in the majors with the Seattle Mariners, but hasn't pitched at that level since 2008. Last season, Feierabend was 10-8, 5.39 in 28 games - 23 starts - with the Lehigh Valley IronPigs.
Pirela, 23, was signed as an international free agent and played three seasons for the Phillies in the Venezuelan Summer League before making his debut in the states in 2010 with the Gulf Coast League Phillies and then moving up to Williamsport. In two seasons in the U.S. Pirela went 7-2 with a 4.83 ERA.
Schoenberger, 23, was signed out of Australia and had been in the Phillies' minor league system since 2007, hitting a combined .217 while playing primarily at second, third and short, with a few opportunities in the outfield.