Audio I/O

• The first control or set of controls in this pane is where you configure which device Audacity should use for sound input and output. For example, some people might have two sound cards, and they want to select which one to use. Some computers have a built-in microphone, and this is also where you'd select whether you want to record from there or from the line-in jack on your sound card. No need to adjust this if Audacity is already playing to and recording from the correct place.

• Record in Stereo: If this is checked, recordings you make in Audacity will be stereo, otherwise they will be monaural. Note that the interpretation of mono recordings depends on your system - on most systems making a mono recording of a stereo input will result in the two channels being mixed, but on other systems it could give you just the left channel, for example.

• Play Other Tracks While Recording New One: Check this box if you want to record multiple tracks over top of one another! Record the first track as usual. Then, with this box checked, click record again. The first track you recorded will play, but Audacity will also record a new track at the same time, maybe allowing you to sing harmony with yourself or add realtime sound effects to a recording.

  You may notice that when you play the two tracks you recorded together, they aren't synchronized. This is normal and is not the fault of Audacity. To fix it, you will need to grab the Time Shift tool and slide one of the tracks around until it sounds right.

Sample Rates

This panel sets the default sample rate for new projects. It does not affect any existing project - to change the sample rate of an existing project, just click on the rate at the bottom of the window and select a new rate from the pop-up menu.

File Formats

• When importing uncompressed audio files...
  • Make a copy of the file to edit: selecting this means that Audacity will run a little bit slower, but it will always have its own copy of any audio you are using in a project. You can move, change, or throw away your files immediately after you open or import them into Audacity.
  • Edit the original in place: selecting this operation means that Audacity depends on your original audio files being there, and only stores changes you make to these files. If you move, change, or throw away one of the files you imported into Audacity, your project may become unusable. However, because Audacity doesn't need to make copies of everything, it can import files much more quickly this way.
• Uncompressed Export Format: This lets you select the format that Audacity will use when you export uncompressed files, i.e. anything other than MP3.
• MP3 Export Setup: Use these controls to locate your MP3 encoder and set the quality of MP3 encoding. Higher quality files take up more space, so you will need to find the level of quality you feel is the best compromise. For more information, see Exporting MP3 Files.

Spectrograms

You can view any audio track as a Spectrogram instead of a Waveform by selecting one of the Spectral views from the track's pop-up menu. This dialog lets you adjust some of the settings for these spectrograms.

• FFT Size: The size of the Fast Fourier Transform (FFT) affects how much vertical (frequency) detail you see. Larger FFT sizes give you more bass resolution and less temporal resolution, and they are slower.
• Grayscale: Select this for gray spectrograms instead of colored ones.
• Maximum Frequency: Set this value anywhere from a couple of hundred hertz to half the sample rate (i.e. 22050 Hz if the sample rate is 44100 Hz). For some applications, such as speech recognition or pitch extraction, very high frequencies are not important (visually), so this allows you to hide these and only focus on the ones you care about.

Directories

Use this panel to set the location of Audacity's temporary directory. Audacity uses this directory whenever you work on a project that you haven't saved as an AUP file yet.