View source for FAQ:Recording - Troubleshooting/it

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<div id="vista_7"></div>
===Why can I not record in Windows Vista or 7?===
On new Windows Vista or 7 systems, you may receive "error opening sound device" when you try to record, and/or have no audio input devices (or only "microphone") in [[Device Toolbar]]. 

To investigate this, exit Audacity then right-click over the <span class="menu">Speaker icon</span> by the system clock and choose <span class="menu">Recording Devices</span>. This opens the ''Recording'' tab of "Sound" in the Windows Control Panel. Show then enable all the disconnected and disabled input devices. For detailed instructions, see [http://wiki.audacityteam.org/index.php?title=Mixer_Toolbar_Issues#cp Using the Control Panel] on the [http://wiki.audacityteam.org/ Audacity Wiki]. 

Many new Windows laptop, notebook or netbook computers only have a single audio input port. This will often be a mono port only meant for microphones. On some machines this single port may also be able to accept stereo line level input which is essential to record from standalone cassette decks or HiFi systems. See "[[How to connect your equipment]]" before connecting high output devices to a sole input. 

See also: 

* [[FAQ:Recording_-_How_To's#streaming|Can Audacity record YouTube, internet radio or other streaming audio?]]

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<div id="playthrough"></div>

===Why can’t I hear what I’m recording?===

To listen while Audacity is recording, enable what is known as hardware or software playthrough as explained below. If you use software playthrough and want to listen to the input without recording it, you must also left-click in the right-hand (recording) section of [[Meter Toolbar#monitoring|Meter Toolbar]] to turn on ''monitoring''.   

====Windows and Linux====
Open the computer's volume control panel. In the playback section, turn off the “mute” checkbox or button for your recording source (usually “microphone” or “line in”) then turn its volume up. This is known as ''hardware playthrough''. You will be able to hear the recording with very little playthrough '''''[[Glossary#latency|latency]]'''''.

If this does not work, open the Audacity [[Preferences]]. In the [[Recording Preferences|Recording]] section on the left, put a checkmark in the “Software Playthrough” box and click OK.  This type of playthrough has latency, so you will hear what you are recording a noticeable time afterwards. You could also experience audio breakup.

====Mac OS X====
Open the Audacity [[Preferences]]. In the [[Recording Preferences|Recording]] section on the left,  put a checkmark in the “Software Playthrough” box and click OK.  
* If Software Playthrough has too much latency, you could try turning it off and enabling "Hardware Playthrough" instead. Unfortunately, with most modern Mac hardware, no audio is actually produced using this option.  
* If Software Playthrough does not produce audio, try the free [http://www.rogueamoeba.com/freebies/ LineIn] application.   

<div class="note">For professional multi-track recordings you may find that Audacity's Software Playthrough has unacceptable latency.
* If the computer's built-in sound device lacks hardware playthrough, you can buy an external USB or Firewire device and hardware monitor through its headphones jack with near zero latency. 
* Alternatively, lower latency software playthrough may be possible using the computer sound device.
For details, see our [[Tutorial - Recording Multi-track Overdubs]].</div>

See also:

* [[FAQ:Playback#usb|Why have I lost sound after connecting a USB device on Windows?]]

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<div id="enhancements"></div>

===Why do my recordings fade out or sound as if they were made in a tunnel?===

This issue is common on new Windows Vista and Windows 7 machines. It can also occur on other machines if the sound device is applying an effect or a corrective enhancement. 

* If the recording is fading out after a few seconds, look for a "'''Noise Suppression'''" setting you can turn off in the ''Recording'' side of the sound device settings. 
* If the recording sounds like it was made in a tunnel, look for an "'''Echo Cancellation'''" setting you can turn off. 
** If there is no echo cancellation setting or it doesn't help, look for "'''Environment'''" sound effects in the ''Playback'' side of the sound device settings - these will affect recordings of computer playback and sometimes other recordings too.   

To change settings on '''Windows Vista and Windows 7''':
# Right-click over the <span class="menu">Speaker icon</span> by the system clock then choose <span class="menu">Recording Devices</span> to open the ''Recording'' tab of "Sound" 
# Right-click over <span class="menu">Microphone</span> and choose <span class="menu"> Properties</span> 
# There will probably be an ''Enhancements'' tab where you can disable all or selected "Sound Effects" - if needs be, also look in the ''Levels'' or ''Custom'' tabs
# If you need to change environment settings, click the ''Playback'' tab in the main window of "Sound", right-click over <span class="menu">Speakers</span>, choose <span class="menu"> Properties</span> then click the ''Enhancements'' tab.     

If there are no settings to change, or on '''older versions of Windows''', go to the "Sound" or similar section of the Windows Control Panel and look for a custom control panel for your sound device.

<div class="note">
Unwanted fading or poor quality can sometimes be caused by inappropriate or outdated sound device drivers. For help, see our Wiki page [http://wiki.audacityteam.org/index.php?title=Updating_Sound_Device_Drivers Updating Sound Device Drivers].
</div>

See also:
* [[FAQ:Playback#muted|Why does playback go quiet when I record or adjust the input volume?]] 

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<div id="sync"></div>
===Why is my new track out of sync with the previous ones, or sounds crackly or at wrong pitch?===
When you make an [[FAQ:Recording_-_How_To's#overdub|overdub recording]] (listening to an existing track while recording a new one), computers can't lay down what you record at the exact instant you sing or play in response to the beat. Therefore without intervention, the recording inevitably gets laid down after the beat. Audacity tries to correct for this "recording latency" automatically by pushing the recorded track backwards after recording stops, but further adjustment may be needed. 

If a new track is not synchronized with the others, you can zoom in and use [[Tools Toolbar#timeshift|Time Shift Tool]] ( shortcut <span class="key">F5</span> ) to drag the track to the correct location. If you are doing a lot of overdubbing, try our [[Latency Test]] to set a custom value for Audacity's latency correction which can then be applied in [[Recording Preferences]].

<div class="note">
[[Tutorial - Recording Multi-track Overdubs]] gives a step-by-step 
guide for manually correcting for latency.
</div>

Recording while playing is much more demanding for the sound device than simply recording. Hardware and sound driver problems or '''''[[Glossary#sample_rate|sample&nbsp;rate]]''''' mismatches between Audacity, the operating system and the sound device can cause poor audio quality or make tracks play and record at different speeds. If a new track is being recorded at a different speed, it will progressively drift apart from the beat of the other tracks, so latency correction will never synchronize it correctly along its entire length. 

'''To fix speed drift, pitch and quality problems, try the following tips.'''   

* Use the same device for playback and recording. 
* Set the [[Selection Toolbar|Project Rate]] bottom left of the Audacity screen to 44100 Hz ''(or if your sound card only uses a particular rate such as 48000 Hz, set the project rate to that)''. Look at {{menu|Help > [[Help Menu#Audio Device Info...|Audio Device Info...]]}} to see the rates the device claims to support.  
* If you are on Windows 7 or Windows Vista, set the Audacity project rate to the same rate as the '''Default Format''' for your sound device. To view the "Default Format", go to the [http://wiki.audacityteam.org/wiki/Windows_Vista_OS#cp Windows Control Panel], select the Playback" and "Recording" tabs in turn, right-click over a device entry > Properties, and look in the "Advanced" tab. If the playback and recording format rates are different, make them the same. Also make sure the number of recording channels set in the Audacity Preferences matches with that specified in Default Format. 
*Select '''Windows DirectSound''' as the "host" in [[Device Toolbar]] in Audacity and on the "Advanced" tab of "Sound" in the [http://wiki.audacityteam.org/wiki/Windows_Vista_OS#cp Windows Control Panel] ensuring both boxes for '''Exclusive Mode''' are checked.
* Make sure the rate of the pre-existing tracks (as stated above the mute/solo buttons) is the same as the project rate. Select the tracks and click {{menu|Tracks > [[Tracks Menu#Resample...|Resample...]]}} to resample the track to the project rate. 
* Ensure your computer sound device has [http://wiki.audacityteam.org/wiki/Updating_Sound_Device_Drivers up-to-date drivers] specifically intended for your particular computer model and operating system, as provided by the motherboard or sound device manufacturer. 
* If you are recording with a USB or Firewire interface, sample rates and number of recording channels '''must''' be the same everywhere. Match the Audacity project rate and the number of recording channels set in the Audacity preferences with those specified:  
** in the Windows [http://wiki.audacityteam.org/wiki/Mixer_Toolbar_Issues#cp Control Panel] or [http://wiki.audacityteam.org/wiki/Mixer_Toolbar_Issues#osx Apple Audio MIDI Setup]
** in any software control panel the device has 
** on any hardware control the device has
* If you receive crackling while playing and recording, try increasing the "Audio to buffer" setting in [[Recording Preferences#Latency|Recording Preferences]]. 
* If you suspect recording dropouts as the cause of loss of synchronisation, read our tips about [http://wiki.audacityteam.org/wiki/Managing_Computer_Resources_and_Drivers managing computer resources].
*To fix recordings already made which are out of step with other tracks, you can use {{menu|Effect > [[Effect Menu#Change Speed...|Change Speed...]]}}; only a very modest speed change will be needed.

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<div id="stream"></div>

===Why doesn't recording from YouTube (or other streaming audio) work?=== 
See this tutorial: [[Tutorial - Recording audio playing on the computer|Recording audio playing on the computer]].
<div class="note">Rather than recording YouTube videos as they play, consider downloading the YouTube videos directly; search Google for how to do that.</div>

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<div id="clipping"></div>

===Why do I get crackles, pops, or distortion when the recording is loud?===

If you hear crackles, pops, or distortion when the recording is loud, or if the waveform is clearly touching the top and bottom edges of the track, you probably have [[Audacity Waveform#clip|clipping]], which means that the signal has exceeded the maximum allowed level.  

Try lowering the record level using the Audacity [[Mixer Toolbar]] or lower the volume of the input source (like the '''tape player''' or '''microphone''', whatever is producing the sound, if it has its own volume control). Many sound cards and USB turntables/tapedecks also have an independent volume control for each of the input connections, which gives you another place to adjust the signal's amplitude.

When recording try to aim for a maximum peak of around –6 dB ''or 0.5 if you have your meters set to linear rather than dB''. You can always boost the level later with the [[Amplify]] or [[Normalize]] effects after you have completed your editing. 
Enlarging the [[Meter Toolbar#resizing| Meter Toolbar]] by clicking and dragging on it may help to gauge levels more accurately.

<div class = "note">'''Help with repairing clipping:'''<br>
If there is only a little bit of '''''[[Glossary#clipping|clipping]]''''' (just the tops of a few isolated peaks), <span class="menu">Effect > [[Effect Menu#Clip Fix...|Clip Fix]]</span> can be applied to just the clipped sections.  This will attempt to reconstruct the missing peaks by '''''[[Glossary#interpolate|interpolating]]'''''  the lost signal. In other cases where there is mild distortion throughout a recording, using  <span class="menu">Effect > [[Effect Menu#Equalization...|Equalization]]</span> to reduce the higher frequencies can help to mitigate the damage.  Sometimes a bass cut will help also by making the result sound less "muddy".
</div>

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<div id="red_line"></div>

===Why do I see a lot of vertical red lines in the track I just recorded?===
This is a visual indication that your recording has [[Audacity Waveform#clip|clipping]]. See the immediately previous FAQ above.  

The vertical red lines show where the clipping has occurred; these clipping indicators can be turned on and off ''(Audacity default setting is "off")'' by selecting <span class="menu">View > [[View Menu#show_clipping|Show Clipping]]</span>.

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<div id="skips"></div>
===How can I record without small skips or duplications?===
If it sounds like recording is skipping, or small fragments are sometimes missing, this means that Audacity can't write the audio to disk fast enough to keep up with what it's recording. You may not hear skips while listening during the recording, but you will hear them on playback.

'''Audacity settings'''
* '''Reduce screen redrawing:''' [[Zooming|Zoom]] out to at least the entire length you'll be recording, or in [[Tracks Preferences]], uncheck {{CheckboxNotChecked|Update display while playing}}. Turn off {{menu|View > [[View Menu#Show Clipping|Show Clipping]]}} while recording. Minimize the Audacity window whenever you don't need to see it.
* '''Turn off {{menu|Transport > [[Transport Menu#playthrough|Software Playthrough]]}}''' unless it is essential you hear what is being recorded.
* '''Increase the default "Audio to buffer" setting''' of 100 milliseconds in [[Recording Preferences]].
* '''Reduce the amount of audio data being written:''' Choose 16-bit Sample Format in [[Quality Preferences]] and set input channels to mono in [[Device Toolbar]] (unless you need stereo). Either of these actions halves the amount of data Audacity otherwise has to write. A single instrument or solo vocal should usually be recorded in mono and can be panned in the stereo field later using [[Track Drop-Down Menu]].
* '''Use a local drive with sufficient space:''' Set the path to the Audacity [[Directories Preferences|temporary directory]] to a local hard drive because these are usually faster than external USB drives. Choose the local drive with the most space. Audacity tells you how much longer you can record for (based on available disk space) in the Status Bar at the bottom of the window.       

'''Computer and hardware''' 

There are many possible actions you can take. Some may have no effect on a skipping problem, others may have a cumulative beneficial effect, so try them all. 

* Quit as many other other applications or processes as possible. In particular, stop anti-virus programs scanning the Audacity [[Directories Preferences|Temporary Directory]]. Disconnect from the internet.
* On Windows, regularly defragment your hard disk drive (this should happen automatically on Windows Vista and later, but don't schedule defragmentation during a recording). Disable Windows Update while recording. Consider creating hardware or software profiles that load only essential hardware and services for a recording session. 
* Set Audacity to a higher priority in the operating system.   
* If you are using a USB recording device. connect directly to a USB port, not a hub.
* Whatever the audio device, ensure it has the latest [http://wiki.audacityteam.org/index.php?title=Updating_Sound_Device_Drivers drivers] as supplied by the motherboard or device manufacturer (as appropriate).   
* A faster processor or more [http://en.wikipedia.org/wiki/Random-access_memory RAM] could help solve the problem. 
* Set [http://wiki.audacityteam.org/wiki/DMA_mode DMA mode] for the hard drive on Windows and Linux, hardware acceleration for the video card and avoid sound card interrupt sharing. 
{{note|More detailed advice on addressing computer and hardware issues can be found at [http://wiki.audacityteam.org/wiki/Managing_Computer_Resources_and_Drivers Managing Computer Resources and Drivers] on the Audacity Wiki.}}

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<div id="pauses"></div>

===Why does my recording keep pausing automatically or why is my recording cursor stuck?===

'''Sound Activated Recording'''
The recording cursor can legitimately appear to be stuck in Audacity if you have accidentally enabled [[Transport Menu#sar|Sound Activated Recording]] in the '''Transport Menu''' and the current recording input is below the threshold level at which recording is set to start. You can tell this is the case because the blue Pause button will be depressed after you press Record. 

To disable Sound Activated Recording, click the {{Menu|Transport}} menu and uncheck ''Sound Activated Recording (on/off)''. 

To make a Sound Activated recording commence, increase the input level, or reduce the "Activation level" at {{Menu|Transport > Sound Activation Level...}}.   

'''Out of resources'''
If you have not activated [[Transport Menu#sar|Sound Activated Recording]] and the red recording cursor won't move from the position where you start to record or stalls while recording, this usually means you are out of computer resources. 

Rebooting the computer may solve the problem.

For an in-depth approach to resolving this please see the [http://wiki.audacityteam.org/wiki/Managing_Computer_Resources_and_Drivers#resources Managing Computer Resources and Drivers] page in the Audacity Wiki.
      
'''Preferences: Audio to buffer'''
Also check the "Audio to buffer" setting; click {{menu|Edit > Preferences}} then click the [[Recording Preferences|Recording]] tab.  

This should normally be set to the default of 100 milliseconds; very low settings will prevent the recording starting.

'''USB turntables and tape decks'''
Reports of recordings from USB turntables freezing or having dropouts are not that uncommon. Generally they are '''not''' caused by Audacity, but by poor quality equipment and cables, or lack of sufficient USB bandwidth.   

* Check the Project Rate bottom left of the Audacity screen is set to either 44100 or 48000 Hz - setting a very high rate might overload the USB bandwidth and cause transmission problems 

* Check the USB cable for tightness at both ends and try using a different cable instead

* Always use a spare USB port, not a hub

* Limit USB bandwidth whilst recording by using other USB devices sparingly e.g. simply disconnecting from the internet may help if you use a USB modem for internet access. 

* Check for any system warnings (e.g. in Device Manager in Windows) about the Universal Serial Bus Controllers. 

* There have been isolated reports that recordings freeze up if they are attempted whilst the unit's RCA cables are connected to an external input such as a home stereo, although concurrent recording and playing through external equipment is implied as being possible.  

Generally, if you find you can record into Audacity without interruption from another source such as a microphone plugged into your computer's microphone port, this implicates the turntable or USB cable. To check if other sources record satisfactorily, go to [[Device Toolbar]] and change the [[Device Toolbar#record|Input Device]] to your inbuilt sound. 

If recordings from sources other than the turntable are also freezing or have dropouts, there could be problems with insufficient computer resources, see above. Please see the [http://wiki.audacityteam.org/wiki/Managing_Computer_Resources_and_Drivers#resources Managing Computer Resources and Drivers] page in the Audacity Wiki for tips on correcting this. 

If you're using "software playthrough", it's also possible that  problems with your inbuilt sound device (used to play back your recording whilst you are making it) are disrupting the recording. Please look at our list of tips on the [http://wiki.audacityteam.org/wiki/Updating_Sound_Device_Drivers Updating Sound Device Drivers]  Wiki page for help.

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<div id="flatline"></div>
===Why do I get only a flat line and no sound when I try to record?===
<div class="editornote">'''Gale 09May12:''' We do not need legacy information in here about "Mixer Toolbar greyed out".
*'''Peter 9May12:''' - ok I removed it.</div>    
If the red recording cursor moves across the screen but no waveform is drawn behind it (only a flat line), you need to start from the beginning and set up your recording device and input source properly. 

'''Step 1: input device'''

Select the input '''Recording Device''' you are using (such as microphone or line-in) in the drop-down selector of the Audacity [[Device Toolbar]]. ''The drop-down selector you need is the one with the microphone icon.''

If you are plugging a microphone or line-in input directly into the jacks on the computer, or recording computer playback such as internet radio, choose the name of the built-in sound device or sound card.
{{Hint|'''By default, Windows Vista and 7 only enable the microphone input.''' You must exit Audacity, then go to "Sound" in the Windows Control Panel to show and enable other inputs before you can record from them. Instructions can be found [http://wiki.audacityteam.org/wiki/Mixer_Toolbar_Issues#vistacp here] in the Wiki.}}        
 
If you are connecting an external device to the computer, such as a USB sound card, USB microphone or USB turntable, choose "USB Audio Codec" or similar.
{{Hint|1='''Detecting USB and Firewire devices:'''<br>If Audacity does not recognise the device, try exiting Audacity and relaunching it, or in current Audacity choose {{Menu|1=Transport > Rescan Audio Devices}}. If that does not help:
# Exit Audacity
# Unplug all other USB devices, then switch off and unplug the recording device at the USB connection and at the mains ''(on Windows, use the "Safely Remove Hardware" icon in the System Tray)''
# Plug the recording device into a spare USB port (not a USB hub), and switch it on
# Wait a few minutes then completely shut down the computer and restart it 
# When the computer has finished rebooting, launch Audacity.
<p>'''Setting sample rates for USB/ Firewire interfaces:'''<br>It's important to set the same sample rate in the project rate bottom left of the Audacity window, in the operating system mixer, in any settings in the device's control panel and on any controls on the device itself.</p>}}

'''Step 2: output device'''

Also in the drop-down selector of the Audacity [[Device Toolbar]] select the output devive you are using, usually this will be your computer's on-board sound card. ''The drop-down selector you need this time is the one with the loudspeaker icon.''

'''Step 3: channels'''

In the Audacity [[Device Toolbar]] set the '''Recording Channels''' to '''1 (mono)''' or '''2 (stereo)''' as required.

'''Step 4: input signal level'''

In the [[Mixer Toolbar]], adjust the '''input level''' using the input slider ''(the one that has the "microphone" symbol)'' in conjunction with the recording level meters on the [[Meter Toolbar]] to set the correct recording level before starting to record for real. 

If the Audacity input slider does not control the recording level of the device, use the slider in the operating system instead. This is usually accessed by a loudspeaker icon near the system clock.

'''Further Help'''

*''Input source unavailable/unselectable, or records incorrectly:'' Try selecting it instead in the system mixer - see the help for [http://wiki.audacityteam.org/wiki/Mixer_Toolbar_Issues#Using_the_Control_Panel Windows], [http://wiki.audacityteam.org/wiki/Mixer_Toolbar_Issues#OS_X-specific_issues OS&nbsp;X] or [http://wiki.audacityteam.org/wiki/Mixer_Toolbar_Issues#Linux-specific_issues Linux]. 
*''Recording computer playback:'' See the special help for [[Tutorial - Recording Computer Playback on Windows|Windows]], [[Tutorial - Recording Computer Playback on Mac|OS X]] or [[Tutorial - Recording Computer Playback on Linux|Linux]].

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<div id="noise6"></div>

===Why do I get a periodic noise every 6 - 12 seconds?===
Audacity writes to disk roughly every 6 or 12 seconds, depending on your preferences settings. If you hear a funny noise in the background that's relatively consistent every 6 - 12 seconds, it means that your soundcard is picking up the noise from your hard drive. 

See [http://wiki.audacityteam.org/wiki/Improving_recording_quality Improving recording quality] in the Audacity Wiki, because you'll probably need to find a better driver or upgrade your hardware.

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<div id="unbalanced"></div>
===Why do I get an unbalanced stereo recording?===

'''Is Audacity set to record in stereo?'''
 
If you are recording a stereo source and the left or right channel is weak or non-existent, first make sure you have Audacity set to record in stereo. 

Do this by setting "Recording Input Channels" to {{DropdownMenu|2 (stereo)}} in the [[Device Toolbar]]. Your recorded track will then say "Stereo" in its Track Control Panel and two channels will be displayed when you press the '''Record''' [[image:Record.png|image of record button]] button.

Make sure your physical recording connections (plugs and sockets) are tight and clean.  Ensure that any balance controls, on for example your mixer or amplifier, are centrally placed. 

Make sure the left and right channels are balanced in the system mixer.  On '''Windows''' this is the recording section of {{menu|Sound}}, {{menu|Sounds and Audio Devices}} or similar in the Windows Control Panel (which you can access by pressing the Windows key on your keyboard), or on '''Mac''' OS X 10.2 or later this is  {{menu|Applications > Utilities > Audio-MIDI Setup: Audio Devices}}.

'''Normalize'''

If you cannot correct the imbalance at the input stage this can be corrected after the recording has been made using the [[Normalize]] effect.  

*In Audacity, click on the [[Audio Tracks#panel|Track Control Panel]] in the empty space above to select all the audio of the track, and click {{menu|Effect > Normalize}}. 

*In the dialog box check {{CheckboxChecked|Normalize maximum amplitude to:}} and type the amplitude level you require ''(-6 dB would be a good setting at this stage)''.  

*Then check {{CheckboxChecked|Normalize stereo channels independently}}.  Then press the {{button|OK}} button.

This will scale the volume of each channel independently to -6 dB (6 dB less than the distortion level) so they are at the same volume level.

{{ednote|1=
{{note|'''Peter 28Aug12:'''[[ToDo]] I propose now to prune this sub-section entirely, it is far too advanced a technique for a simple FAQ and the Normalize effect will be a more than satisfactory tool for 99% of the users.  The FAQ stands well enough without it.  Comments?
}}
'''Adjusting the Channels Independently'''

Alternatively you can click on the downward pointing arrow in the [[Audio Tracks#panel|Track Control Panel]] to reveal the  Track Pop-Down Menu and and choose [[Track Drop-Down Menu|Split Stereo Track]] from the menu. This enables you to separately edit and control the left and right channels. 

'''''Using the Gain Sliders'''''
Press the green Play button or Space and use the gain sliders [[image:TrackGain.png|Track Gain Slider]] on the [[Audio Tracks#panel|Track Control Panels]] of the left and right channels to adjust the gain on each to your satisfaction as the track plays. Note this is not an edit of the [[Audacity Waveform|waveform]] so it won't change appearance, although the gain changes are respected when you export the audio. To edit the waveform itself so you can see what the exported waveform will look like, select the audio and use {{menu|Tracks > Mix and Render}}.       

If you are changing the gain on the tracks with the gain sliders, make sure before you export the audio that you don't apply too much gain so that the result distorts. You can check this by looking at the green VU Playback Meter in the [[Meter Toolbar]]. 

'''''Using the Amplify Effect'''''
If you prefer to adjust the gain on each track to a precise level avoiding any risk of output distortion, click in the [[Audio Tracks#panel|Track Control Panel]] of the left channel to select it and then use {{menu|Effect > Amplify}} choosing your required '''New Peak Amplitude''' ''(the box underneath the slider)''.  Then repeat for the right channel and amplify that to your chosen '''New Peak Amplitude'''. You must amplify both channels separately if you want to change the balance between them.

Unlike using the gain sliders this will edit the waveform and the result will show in the [[Audacity Waveform|waveform]] display.

'''''Remake the stereo track'''''
After the amplitude adjustment, you will need to rejoin the split tracks to make a stereo track once more.  To do this click on the downward pointing arrow in the [[Audio Tracks#panel|Track Control Panel]] for the top track of the two and in the drop-down menu select [[Track Drop-Down Menu|Make Stereo Track]].
}}

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<div id="offset"></div>

===Why is the recorded waveform not centered on the horizontal line at 0.0?===

'''Cause and impact'''

This off-setting of a signal from zero is known as DC offset;  a signal with DC offset would appear in the Audacity default [[Audacity Waveform|Waveform]] view not centered on the 0.0 horizontal line. 

A sound that has DC offset will not be at its loudest possible volume when normalized or ampli (because the offset consumes headroom). This problem can possibly extend to the mix as a whole, since a sound with DC offset and a sound without DC offset will have DC offset when mixed.

DC offset can cause inaudible low level distortion (which becomes audible when other filters are applied or if the sound is compressed upon export). It can cause clicks at the start and end or distortion after running effects. 

'''Removal'''

If this is the case with your recording, to remove the DC off-set use {{menu|Effect > [[Normalize]]}}. 

Put a check mark in the {{CheckboxChecked|Remove any DC offset...}} box but leave the {{CheckboxNotChecked|Normalize maximum amplitude..}} box unchecked and then press the {{button|OK}} button.

'''Hardware upgrade'''

The normal cause of DC offset is a faulty, or poor, sound card.  So it may be worthwhile considering upgrading your computer's on-board sound card or purchasing an external sound card.

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