Mac and USB input devices
|On Mac OS X using current Audacity or legacy 1.3.12 or later, the following procedure should get sound from the USB audio input device into Audacity. This includes USB turntables, USB cassette decks and external USB audio input/output adapters.
1) Connect the USB device directly to a free USB port on your Mac. Do not connect through a USB hub. Turn the device on. If it is a USB turntable or cassette deck, begin playing an LP or cassette. For other USB interfaces, input some sound to the device.
2) Choosethen select the Sound preferences panel, then click on the Input tab.
- "The selected device has no input controls" - this means that whatever level the device sends to your Mac is what you get.
- The grey "Input level" meter is showing that sound is being input.
|If there is no indication on the Input level meter, stop now and figure out why.
Assuming you have sound coming into your Mac through the USB device, continue as follows.
3) Start Audacity and choosethen the Devices section.
- Under "Recording" make the choices shown.
- Note that you do not want to set the Playback Device to your USB device in the case of a USB turntable or cassette deck. In most cases you will want the Playback Device set to "Built-in Audio" or "Built-in Output". This will cause playback to occur through your Mac's built-in speakers.
- Click to accept the settings.
4) Click on themenu and make sure that "Software Playthrough" is checked.
5) Note that the Input volume slider is greyed out and cannot be used. Remember that "The selected device has no input controls".
6) With the LP or cassette playing, or with sound being input to the USB interface, click on the recording meter to begin monitoring.
- Make sure that the levels are below 0 dB, and that the red clip lights do not come on.
- Some USB turntables have a volume control somewhere on the chassis. If the levels are too high in Audacity, look on the turntable or in your manual to see if you have a volume control. For external USB audio interfaces, simply turn down the volume of the device that is feeding the USB interface.
|If you got an indication on the grey System Preferences input level meter in step 2, but do not get any indication on the Audacity input level meter, go to the next section and use Audio MIDI Setup to set up your USB device.|
7) If you have got this far and are getting a good indication on the recording level meters, you are ready to begin recording!
Using Audio MIDI Setup
You must use Audio MIDI Setup if you want to change the bit depth or sample rate of your device.
1) Quit Audacity if necessary.
2) In the Finder, choose
If the "Audio Devices" window is not visible, choose
- What the symbols mean
- The input device with the microphone symbol is the chosen input device.
- The output device with the speaker symbol is the chosen output device.
- The output device with the Mac "face" symbol is the device that will play "alert" sounds.
- Make the selections as shown above
- Click on "USB Audio CODEC 2 in/ 0 out" to select it.
- Click on the Action menu ("gear" icon) and select "Use this device for sound input".
- the microphone icon may already be beside "USB Audio CODEC 2 in/ 0 out"
- "Use this device for sound input" may be greyed out in the Action menu.
Note that the microphone symbol has moved to the "USB Audio CODEC 2 in/ 0 out" device.
- Make the selections as shown above.
- The Format settings of "44100.0 Hz" and "2ch-16bit Integer" are standard for most interfaces, and correspond to the Red Book audio CD standard.
- Note that the "Volume" sliders are disabled - as expected, since the selected device has no input controls.
3) Quit Audio MIDI Setup, start Audacity and click onthen the Quality section:
- Under "Sampling", set "Default Sample Rate" and "Default Sample Format" to match the settings you made in Audio MIDI Setup.
4) Test the input as in steps 6 and 7, above. If you still can't get sound into Audacity, post a message in the Mac section of the Audacity Forum.