From Audacity Manual
Using the drag handle at right, you can expand Device Toolbar rightwards to be wider than the default width shown, or drag it leftwards to be less wide. You can hover over any of the four boxes in Audacity at any time to see the full text for the selected item.
Selects the particular interface with which Audacity communicates with your chosen playback and recording devices.
On Windows, the choice is between the following audio interfaces:
- MME: This is the Audacity default and the most compatible with all audio devices.
- Windows DirectSound: This is more recent than MME with potentially less latency.
- Windows WASAPI: This host only appears on Windows Vista, Windows 7 and Windows 8. The only recording devices that are currently provided are "loopback" devices for recording computer playback. 24-bit recording devices are supported. Playback is emulated using this host. As a result, the playback slider in Mixer Toolbar will only scale the system playback slider's current level up or down rather than directly manipulating that system slider.
On Mac OS X the only choice is Core Audio.
On Linux there is often only one option: ALSA. Other options could be OSS and/or Jack Audio Connection Kit (also known as "Jack" or "Jackd").
- On Windows XP or earlier (given a recent computer), DirectSound's much shorter path to the hardware should produce much lower latency than MME.
- On Windows Vista, Windows 7 and Windows 8:
Choose the built-in or attached sound device that you want to use for playback.
In the image above, "Microsoft Sound Mapper - Output" appears when the Windows "MME" Audio Host is selected. This "Mapper" device is not a separate playback device, but is the device that is currently chosen as the default system playback device in the Windows Control Panel. When "Windows DirectSound" Audio Host is selected, the device that maps to the current Windows playback device is called "Primary Sound Driver".
In most other cases (for example, the inbuilt computer sound device), each entry for playback device consists of the type of playback device (such as speakers), followed in parentheses by the name of the sound card manufacturer (such as Realtek, Soundmax or IDT Audio).
On Mac OS X, the internal sound card playback device is usually referred to as "Built-in".
On GNU/Linux, playback is often managed by a sound server or mixer such as pulse or dmix. It is normally best to select "default". This will choose whatever is the system default playback device or server. The (hw:) playback devices give direct, lower latency access to the sound card output, bypassing any sound servers.
Choose the built-in or attached sound device that you want to use for recording.
In the image above, "Microsoft Sound Mapper - Input" appears when the Windows "MME" Audio Host is selected. Similarly to the "Mapper" output, the "Mapper" input is the device that is the current default Windows recording device. When "Windows DirectSound" Audio Host is selected, the device that maps to the current Windows recording device is called "Primary Sound Capture Driver".
In most cases (for example, the inbuilt computer sound device), each entry for recording device consists of the type of device (such as microphone), followed in parentheses by the name of the sound card manufacturer.
On Mac OS X, the internal sound card recording inputs are usually referred to as "Built-in".
On GNU/Linux, recording is often managed by the pulse sound server. It is normally best to select "default". That will choose whatever is the system default sound card or server, then choose the exact input device required in the control application for the card or server (such as Pulse Audio Volume Control). The (hw:) recording devices give direct, lower latency access to the sound card inputs, bypassing any sound servers. For a built-in (hw:) sound device, choose the exact inputs in ALSAmixer.
|If you attach or disconnect an external device while Audacity is open, useto update the device lists before playing or recording.|
1 (Mono), 2 (Stereo) or the number of channels that are provided by the drivers of your sound device. On most inbuilt sound devices, especially on Windows, only mono or stereo will be available. For some devices on Windows, choosing Windows DirectSound in "Audio Host" above may be more likely to reveal options for recording more than two channels. On some devices capable of recording more than two channels, an explicit "multi" device may appear in the "Device" drop-down for recording all the channels simultaneously.
- If your recording device is mono, such as most microphone ports for the inbuilt sound device, selecting "2 (Stereo)" in Recording Channels duplicates the mono source to both channels, merely producing a dual mono recording.
- If your recording device is stereo, then as well as setting Recording Channels to "2 (Stereo)", ensure any settings in the system or sound device control panels are stereo. Many input devices on Windows Vista, Windows 7 and Windows 8 default to mono recording even if they are stereo devices. To correct this, follow these instructions.