For information about recording in these formats, see How do I record and open files in Waveform Audio formats (Wav, mp3s, Sun au, etc)?

If you try them all and it still doesn't work, it may mean you have a half duplex sound card which means that it can't record and play at the same time. Sometimes a full duplex sound card may be shipped with a half duplex driver in which case one just needs to update the driver - that may be worth checking up on. With most Pcs, it is possible to install more than one sound card - so this is another possible solution if you need to get a full duplex one for recording.

Or get an external USB soundcard for a laptop. More.

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