4.2.1. Recording Settings
On the Recording Settings dialog you can select the sound card from which to record, and you can adjust its volume. You can also adjust the format of the recorded data.
This is the input line from which to record audio data when you press the record button. If you have more than one sound card installed, for example because you are using an external USB microphone, make sure that the correct one is selected here.
This determines the sensitivity of your microphone or input line. It is very important to set this so that the full dynamic range is used without clipping to get a good recording. A clipped signal will cause artifacts in the spectrogram.
Recording source and volume can also be set through the input level meter on the toolbar. You can set the recording volume by moving the slider, and you can select the input source by right-clicking on the input level meter:
These settings can only be changed on new files, before you have made any recording. The format of existing recordings cannot be changed. If you want to change these settings and they are disabled, click on→ first.
The Sampling Rate determines the number of measurements (samples) per second recorded from the input source. This is the same setting found on the Analyzer Settings dialog.
The channel format allows you to select between stereo and mono recordings. It is also possible to extract only the left or right channel of a stereo signal and save the resulting recording into a mono file. This can be useful with certain sound cards that do not properly support mono recordings, or if a stereo sound card has only one mono microphone connected to one of the channels. Note: A stereo recording requires twice as much storage space as a mono recording.
The sample size influences the quality but also the storage requirements of the recorded sound. The default setting of 16 bit per sample corresponds to the quality of standard audio CDs and should be sufficient for most purposes. A higher bit depth of 24 or 32 bit can be useful when the dynamic range of the recorded signal is very high, and when it contains very quiet passages that should later be amplified.