Default Format sets the specific sample rate and number of channels for the sound device when running in "Shared Mode".
The two modes are set at Sound in the Windows Control Panel by right-clicking over the sound device > Properties, then choosing the "Advanced" tab.
Default Format (Shared Mode) / Exclusive Mode and sample rate selection: These modes are new features of the WASAPI audio API.
To fix it, right-click over the speaker icon by the system clock > Sounds, click the "Communications" tab, then choose "Do nothing" for adjusting sound levels.
Playback suddenly becomes quieter, especially when recording over an existing Audacity track: This is a Windows 7 setting designed with internet calls in mind.
You can turn them off by following the steps in this Frequently Asked Question. These features are unsuitable for high-quality audio recording.
Recordings fade out or sound as if they were made in a tunnel: Many Windows machines (especially laptops and notebooks/netbooks) have recording features designed to minimise distortion when recording internet calls.
On the "Advanced" tab, in the "Default Format" section, change the dropdown menu to one of the "2 channel" options ("2 channel 0 Hz" will usually be the optimal choice).
Right-click over the device you are recording from and choose "Properties".
In the Windows System Tray (by the clock), right-click over the Speaker Icon > Recording Devices or click Windows Start, navigate through the Control Panel to "Sound", then click the "Recording" tab.
To make Windows send stereo input to Audacity: If this happens, recording a stereo device with two input channels chosen in Audacity's Device Toolbar will merely duplicate one channel into both channels of the track, making it dual mono. However any input regarded by Windows as a "microphone" (including not just USB microphones but USB turntables and cassette decks) will default to mono recording.
Inputs seen by Windows as "microphones" default to mono recording: While most microphones and microphone inputs are mono, some external microphones such as USB microphones or microphones connected through external mixers or interfaces may be stereo.
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