For those who want to hear what they are recording there is the very useful option in the menu . I advise using it as much as possible especially if you do things like using the compressor or other effects and want to control what actually is recorded.
Be sure to not build a feedback loop while recording from out_soundcard and activating . Such a loop is way to much for poor aRts and it slows your system heavily down! You might kill aRts...
The reason is that aRts calculates a network for audio for every sample (acually blocks of samples) and if on sample is build via a loop from itself aRts has to calculate more than is possible.
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