Overdubbing using your computer's on-board soundcard

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Revision as of 11:28, 30 April 2012 by PeterSampson (talk | contribs) (THIS IS A WORK IN PROGRESS: forcing the formatting to do what I intend)
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THIS IS A WORK IN PROGRESS

This tutorial is designed to help you record multi-track overdubs if your equipment does not have hardware playthrough of the live recording and software playthrough is not an option. Before starting this tutorial you can try the following playthrough possibilities.
  • On Windows or Linux, try unmuting your input in the playback side of the system mixer. This will give you low latency hardware playthrough of what you are recording. Older Windows XP systems quite often have this feature.
  • On all operating systems, try Transport > Software Playthrough (on/off) in Audacity instead, but this will always mean you hear yourself late and could cause audio breakup.
  • To achieve lower latency software playthrough on Windows you can:
    • (Only gives somewhat lower latency): On Windows Vista and 7, right-click over the Speaker icon by the clock, choose Recording Devices, right-click over the input, choose Properties then on the "Listen" tab, enable "Listen to this device".
    • (Advanced) Compile Audacity with ASIO® true low latency support. Ask on the Compiling Audacity board of the Forum if you need help.

Introduction

This tutorial describes a known working method of creating a multiple sound track overdubbing session from scratch in Audacity; that is, you record one track and then play it back and add a second track against it -- drums, guitar, voice -- repeat as needed.

This process uses your computer's built-in microphone and a pair of headphones. You must be happy with not hearing yourself -- your live performance -- in real time in your headphones. You will hear all the previous tracks mixed as you wish, but your live voice or performance will not be in the mix until you finish recording and play the whole thing back. Including your live voice in the electronic mix on a home computer can be very difficult.

You can leave one earphone off and cup your hand so it forms a tunnel between your lips and your ear. Some professional recording artists feel this is a more natural method.

Hardware

Almost any Windows®, Mac® or Linux® machine with a built-in microphone can be used.

Our example here uses Mac earbuds for listening, but nearly any good headphones or earbuds are OK.

File:MAC earBuds.JPG

First Recording

First we will make a simple recording with no overdubbing or other fancy tricks. The system has to work correctly for simple recording and playback before we go further.

This is not a tutorial on making a recording and playing it back, but you need to be able to do that before you do anything else. There are multiple tutorials and wikis on Recording.

Connect the headphones.

Set the computer control panels, Audacity Preferences and Audacity drop-downs to recognize the computer's built in headphones for playback and to use the built-in microphone for recording.

Set Audacity Preferences:

  • Bill 20Apr 12: ToDo-2 Is the below usage of the menu span appropriate? Preferences > Quality is not a menu choice.

I'd re-write this as: ...

  • Peter26Apr12: agreed Bill so I adopted your formatting.
    ToDo If and when we get such formatting in the Wiki than I will change the three h/w overdubbing tutorials.
    ToDo-2 In fact should we be rewriting this using the Device Toolbar and the Transport menu rather than setting Preferences?

Click on Edit > Preferences (Audacity > Preferences on Mac)

  • in the Quality tab:
    • set Default Sample Rate to

44100 Hz  MenuDownArrow.png


    • set Default Sample Format to

32-bit float  MenuDownArrow.png


  • in the Devices tab:
    • Under Playback set Device to the on-board sound card
    • Under Recording set Device to the on-board sound card and set Channels to

1 (Mono)  MenuDownArrow.png


  • in the Recording tab:
    • check CheckboxChecked.png Overdub: Play other tracks while recording new one
    • uncheck CheckboxUnChecked.png Hardware Playthrough: Listen while recording or monitoring new track (Mac only)
    • uncheck CheckboxUnChecked.png Software Playthrough: Listen while recording or monitoring new track


You may want to make the Audacity project window larger than its default and expand the Meter Toolbar.

Click once anywhere inside the recording meter (the one with the mic icon) to put the meters into Monitor Mode. They will display the microphone's sound level without starting Audacity recording and wasting drive space. This may fail on certain Linux machines using Jack.

Find your microphone; scratch or tap around your computer until the red recording meters go sharply up. Some computers have it in the lid, some in the grill just beside the LEFT SHIFT key.

Play or sing into the microphone. Adjust Audacity's recording control so you don't peak much over -10 to -6 on Audacity's meters. You can fix low levels later, but you cannot fix overloading, smashing, and clipping (meters too far to the right).

Click "Record"; Audacity will take a second to configure itself and start recording. The blue waves will start to crawl left to right as you perform. Play or sing a simple song that you can use for rhythm and timing tests later.

Click "Stop", then "Home" and then click "Play" to hear the track you have just made. You should hear the track in your headphones. This is all you will hear during the overdub sessions. You will only hear your voice or instrument in your headphones after you record it.

Setting the Recording Latency

Latency refers to the delay between the time the audio enters the computer and the time Audacity is able to record it to a track. For example, if you are recording a keyboard track, latency is the delay between the time you strike a key and the time that note is recorded.

For instructions on how to adjust the latency please see the Latency Test page in the manual.

  • To achieve lower latency software playthrough on Windows you can:
    • (Only gives somewhat lower latency): On Windows Vista and 7, right-click over the Speaker icon by the clock, choose Recording Devices, right-click over the input, choose Properties then on the "Listen" tab, enable "Listen to this device".
    • (Advanced) Compile Audacity with ASIO® true low latency support. Ask on the Compiling Audacity board of the Forum if you need help.

Performance

Click on the [X] in the Track Control Panels to delete all the test tracks. You're ready for the first proper recording session. The first recording can be whatever you're planning to use as a base, backing track, guide or rhythm track. It can be anything including Generate > Click Track which can be adjusted with its control panel for rhythm and composition. You could use the music from a rhythm and chord machine playing to the mixer. You could use existing sound files.

You should record a lead-in. That is, a non-musical rhythmical clue before the music starts so as to warn you of the imminent start. In a live band, this would be the drummer or lead guitar count-in. You could use the keyboard rhythm stops or you can perform several rim shots into the microphone to establish the rhythm before the first note; tapping on the table with a pencil also works. You can sheer it off later in post production so nobody else will hear it. Tick, tick, tick, tick, music; adjust as appropriate for music type and rhythm.

Click "Stop", then "Home" and then "Record" to record track two using your live performance and track playback in your headphone mix as a guide. Repeat for as many tracks as required.

The "Mute" and "Solo" buttons to the left of each track are valuable in overdubbing. Solo causes only that track to play and Mute turns that track off. Solo has options that can be set in Preferences. The little volume control to the left of each timeline also controls the playback volume -- it affects the headphone mix.

When you get to a stopping point, click on "Stop" and File > Save Project As to save your project. As you progress, you should save a new Project periodically with a slightly different filename. A good recommendation is to use ISO date and time for the file names or the start of the file names; also, refrain from using slash marks or other punctuation marks in a file name.

ISO Date and time

201110011500.aup That's 3PM. 2011 October First, 1500hrs.

Then save a new version of the song about every twenty minutes:
201110011520.aup
201110011545.aup
201110011602.aup

Do not go weeks with one Project and file name, and never cover up or record over existing work. If anything happened to that one Project, your project would be ruined and could nullify weeks of work. Think of what would happen if the lights went out right now, the computer ground to a halt and you were forced to use the last known good version of the show.

Audacity Projects are not a good format for archive or playback outside Audacity and they do not save the UNDO history. Therefore export to 32-bit WAV for archive and 16-bit WAV for Music CD, or MP3 for internet delivery and e-mail. Do not do production in MP3. You may need to adjust the volumes and levels of the show so the Export doesn't overload.

All of the Audacity editing, filtering, and effects tools are available for each track or any combination of tracks before or after you sing/play, but not during; Audacity will not apply filters and effects in real time.

Troubleshooting

  • How much hard disk space do you have available? If your only experience with computer files is with spreadsheets, e-mail or Photoshop pictures, live audio (and video) production will stun you with the amount of disk space it consumes. With high quality overdubbing and UNDO, project files and folders get big in a hurry; with periodic saving, a project can get very seriously large.
  • Communications features on newer Windows machines can cause unwanted changes in recorded volume or make the recording sound tinkly and/or hollow. See this FAQ.
  • You can try to listen to yourself in the headphones by changing an Audacity setting: Audacity Preferences > Recording : [X] Software Playthrough (select for ON).
  • Record a track with that setting. Chances are terrific that your headphone voice and your real voice aren't going to match. This is computer or sound channel latency and there's no adjustment for it. You should probably leave that setting deselected.

Links

|< Tutorial: Recording Multi-track Overdubs