Carbon Leaf is planning to unplug at this weekend’s Wolf Trap shows, giving audiences a long look at its indie rock roots. Since taking a step back and amicably departing from Vanguard Records in 2010, the band has been on fire, releasing “How the West Was One” and “Christmas Child” last year before making “Live, Acoustic … and in Cinemascope!” That album will be available in May 2011. Now the bandmates are planning another release this year. Such a ramped-up release schedule was one of the reasons the bandmates wanted to return to indie status.