From EZ SoftMagic:
MP3 Splitter & Joiner Pro is an useful audio editor which builds MP3 Splitter Pro and MP3 Joiner Pro in one. you can split large MP3 MPA WAV files into multiple smaller pieces or merge multiple MP3 MPA WAV WMA OGG AIFF files to a larger one. It is easy to use with automatic split/merge mode and split by silence (automatic silence detection). With 'Batch Split' feature, you can split multiple audio files easily by just a simple click. With 'Partial Merge', you can merge any portions of audio files directly by just a simple click without export the portion in advance. It's able to merge and split audio files of extreme large size over 4GB.