Terrible - unless Im using wrong

Zero stars. "Boom effects cannot be applied because song is DRM protected." This is the message I get on every song I tried. Songs purchased from iTunes and songs I had purchased from a store bought CD. If Im not using the app correctly, please let me know, and Ill happily revise my review. Otherwise, this app is simply worthless.

rockaround about Boom: Bass Booster & Equalizer, v1.2