It can convert and mix sound files into one large wav file.

Audio Converter & Mixer is an easy-to-use tool for converting and mixing all kinds of sound files into one large wav file. It can configure the volume, start time and playback speed of each sound track. It can extract sound track from many audio formats such as WAV, MP3, WMA, AC3, OGG, MPA, MP2, AU, AIF, SND, etc, and video formats VCD, MPEG, AVI, WMV, ASF, OGM, DIVX, DAT, SVCD etc. The mixing speed is extremely fast and the output wav file has CD quality(44100Hz, 16Bits, Stereo).