MicroAC is a simple to use yet powerful, streamlined OS X batch audio converter designed to help you convert Core Audio compatible formats.

MicroAC gives you control for how many files to concurrently convert - convert a few or a ton at the same time!

MicroAC is a GUI version for Apple's command line "afconvert" tool and comes with support for most of its input and output formats.

Features:
-Drag And Drop
-Concurrency control
-Queueing & Requeueing
-Sample Rate
-Channels

Formats:
3gp (.3gp)
aac, aace, aacf, aach, aacl, aacp

3gp2 (.3gp2)
aac, aace, aacf, aach, aacl, aacp

AIFC (.aifc, .aiff, .aif)
ima4, PCM I8, PCM UI8, PCM BEI16,
PCM BEI24 PCM BEI32, PCM BEIF32, PCM BEIF64

AIFF (.aiff, .aif)
PCM I8, PCM UI8, PCM BEI16, PCM BEI24 PCM BEI32

Apple MPEG-4 Audio (.m4a, .m4r)
aac, aace, aacf, aach, aacl, aacp

Apple MPEG-4 AudioBooks (.m4b)
aac, aace, aacf, aach, aacl, aacp

CAFF (.caf)
aac, aace, aacf, aach, aacl, aacp, ilbc,
ima4, PCM I8, PCM BEI16, PCM BEI24 PCM BEI32,
PCM BEIF32, PCM BEIF64, PCM LEI16, PCM LEI32,
PCM LEF32, PCM LEF64

MPEG-4 Audio (.mp4)
aac, aace, aacf, aach, aacl, aacp

WAVE (.wav)
PCM I8, PCM BEI16, PCM BEI24 PCM BEI32, PCM BEIF32,
PCM BEIF64