Super Audio Assistant is a combined audio tool - Audio Converter, Audio Mixer, Recorder, KaraOke, CDRipper.
1. Converter: Convert Between two audio file with different format, support all most popular audio format like mp3,ogg,FLAC,ape,wav.
2. Mixer: Mix or Concatenate two audio file to one.
3. Recorder: Record the voice from the microphone to wav or mp3 file.
4. Record-Mix(KaraOk): Record the voice from the microphone and then mix with a background audio file.That's like a "Kara OK" tool.

The license of this software is Free Trial Software, the price is $19.99, you can free download and get a free trial.