Thanks for the reply.
There was no"inevitable latency"when recording a karaoke track on track 1
and then a vocal on track 2. Both on the same settings
stop the insanity http://www.damm-madd.com/
----- Original Message -----
To: "Michael Reeves" <michael1r@...>
Sent: Sunday, November 26, 2006 12:26 PM
Subject: Re: [Audacity-help] help
> | From Michael Reeves
> | Sun, 26 Nov 2006 02:26:28 -0600
> | Subject: [Audacity-help] help
> | I changed the bit rat to 48 on 16 bit and it seemed to do good
> | recording track 1 as a karaoke song and then track two as a vocal.
> | But when I record live music on track 1 and then add another track of
> | additional instruments the timing gets further and further off as the
> | song progresses.
> | I am running a Compaq , windows xp, 1gb ram , celeron 2.5ghz
> | processor with on board ac97' sound with the most updated driver.
> There is an inevitable latency in consumer-level computer audio
> setups, which means there will always be a delay between singing, or
> hitting a note on an instrument, and that sound being laid down in
> the recording. Audacity will try to correct for this by pushing the
> track backwards slightly after recording, but you can always adjust the
> synchronisation of the recorded track with the one already on screen by
> using the Time Shift Tool <---> top left to drag the recorded track left
> or right to its correct position.
> If you are sure that the newly recorded track does become increasingly
> out of synchronisation with the base track (so that using the Time Shift
> Tool does not help), then it would appear that the output is playing back
> at a different rate to that at which the input records.
> How did you record the "live music on Track 1" - with the stereo mix or
> similar option on the Mixer Toolbar dropdown? Are you in your second
> scenario using different devices to play back and to record from, (e.g.
> recording with a USB mixer but playing back using your inbuilt sound)?
> If you do this the clocks of the two devices won't match, so a second
> track will drift apart from the first. In this case, select the same
> for recording and playback on the Audio I/O tab of Preferences.
> If your recording and playback devices are the inbuilt sound you may
> have a driver bug causing the wrong sample rate to be selected for either
> recording or playback. It is quite a common problem with Windows generic
> drivers. Try updating the sound device drivers to the latest ones for your
> computer model from the manufacturer of the sound device or motherboard.
> These are normally available from their website, or you can try updating
> sound device drivers from Device Manager or from the Hardware tab in
> Sounds and Audio Devices in the Windows Control Panel.
> Or you may have a malfunctioning sound device which runs record and
> playback independently and so doesn't hold synchronisation, or plays back
> and records at random speeds. In this case you will need to replace the
> sound device.
> As a workround to bring tracks you've already recorded back into
> synchronisation, you could select all the track by clicking in the track
> panel and Effect > Change Speed. You can experiment by entering
> small values in the "Percent change" box. If the newly recorded track is
> getting ahead of the beat, enter a negative value in the box or move the
> slider very slightly to left ; if the new track is falling behind the
> enter a positive value or move the slider very slightly to right.
> The other possible cause of loss of track synchronisation is recording
> length inconsistencies introduced by dropouts or duplications when the
> computer doesn't keep up with the recording process. However this
> should be audible or even visible in the waveform if this is the problem.
> For some suggestions on avoiding recording dropouts and duplications
> (and for general information) please see our recording tips pasted in
> Gale Andrews
> Here are some general tips on avoiding recording problems.
> * Close all other programs while recording. Be aware of background
> virus scanners and other system tray programs. Norton, Sophos and other
> anti-virus products scan each file as it is opened and closed by default.
> On a slow computer this scanning can affect recording as it takes too
> * Reduce the bit depth for recording and importing from the default
> 32 bit to 16 bit at Edit > Preferences > Quality tab: Default Sample
> Format. Reducing the bit depth halves the amount of data stored and the
> time taken to write it to the disk.
> * Don't record stereo unless you have to. Stereo requires your machine
> to handle twice as much data. A single instrument or solo vocal track
> usually be recorded mono. You can position it in the stereo mix later. To
> record in mono, set recording channels to "1 (mono)" on the Audio I/O
> tab of Preferences.
> * Turn off "Auto-scroll while playing" at Edit > Preferences >
> Interface. This stops the display re-drawing as the recording is made
> so reduces the amount of processing power used, freeing power for
> recording. Alternatively minimise Audacity during the recording.
> * Zoom out to the whole length you will be recording
> * Disable the Meter Toolbar at Edit > Preferences > Interface
> as this will conserve resources on a slower computer
> * Make sure your system swap or paging file is large enough. As a
> working rule, with RAM of less than 512 MB the swap file should be set to
> 1.5 times the available RAM. Recordings will stop if the swap file is full
> and cannot be increased in size and there is no RAM left to use.
> * Defragment your hard drive (only affects Windows users). This
> the speed your computer can read and write information at by ensuring that
> files are kept close together in a logical manner.
> *Windows 2000/XP users can try increasing the priority of Audacity
> in Task Manager. On GNU/Linux you can run as root (back up everything
> first and not recommended unless you are on a standalone machine)
> * Make sure (Windows/Linux) that DMA mode is enabled for your
> hard drive - see
> *Try to avoid interrupt sharing for your soundcard
> * Update your hardware drivers to avoid conflicts and get better
> hardware performance. Key targets are:
> o Sound Card. This is also a common cause of crashes, especially
> during recording
> o Video (Display) Card
> o Hard Drive controller - This is especially important for RAID
> other high performance controllers.
> * If you are making a long recording and you will be away from the
> computer, it is advisable to disable any screensaver you have. Simply
> switch the monitor off instead.
> * If you have audio equipment such as microphones or amplifier close
> to the computer, consider moving them apart, altering the grounding so
> that the PC is not grounded together with the audio equipment, and using
> high quality shielded audio cable, to prevent extraneous noises from the
> equipment or the computer seeping into the recording.
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