Since the 2007 release of her debut Say It, Britt Nicole has eased into the role of a Christian singer/songwriter with increasing maturity and confidence. Her upward trajectory is confirmed by her EP Acoustic, featuring a well-chosen selection of previously released songs (plus one new number) offered in a folk-pop format. By stripping away their hard-pumping beats and glossy techno colors, tunes like “Set the World On Fire” and “Headphones” gain a fresh intimacy and spark. The joyful shuffling groove of “Hanging On” works especially well as an acoustic number. More importantly, Nicole’s heartfelt Christian testimony seems more direct and emotionally resonant in these quieter settings. As a singer, she’s gained more nuance and power from her earliest recordings. Acoustic’s arrangements reveal her R&B influences more clearly, as her rhythmic shadings in “Walk On the Water” attest. The newly recorded “Found By You” is a passionate confession of faith with a light string backdrop.