M9 Docs   Audio Lab

In the Audio Lab, you can edit the audio streams and samples used in your project.

For audio clips, you can set the precise start location via the timebar's context menu -> "Set Start Position". You can also use a marker for an audio clip start position, which has the advantage that multiple audio clips share the same start marker and changing the marker updates all these audio clips together. To set a start marker, right-click the marker and choose "Set Start Marker". To unset a start marker, right-click it and choose "Set Start Position".

You can drag markers to where you want, eventually zoom in to get a more detailed view. Note that, by default, snapping is done on zero-crosses to avoid audio clicks.

In the Audio Lab, you can also apply basic functions on a selection of the audio. Right-click the audio display for the context menu which also includes DSP functions like Mute, Gain, Fade, etc... Note however that, for audio streams, these DSP functions are applied directly on the audio file itself, so make sure to backup the audio file if you want to keep the original version! For samples the DSP functions are applied in RAM and so the original sound file is not affected, unless you would explicitly save it of course.

Info Tips

  • Click-drag to lasso-select a section. For stereo audio:
    When the mouse is at the very top of the left channel, selections are made for the left channel only.
    When the mouse is at the very bottom of the right channel, selections are made for the right channel only.
    This also works for shortcut functions.
    Functions like Gain, Mute, Reverse etc. then only work on the selected channel. (except Stretch)
  • Double-click selects the section between the previous and next markers.
  • Shift+Double-click extends the selection with the section between the previous and next markers.
  • To pan/zoom the editor, use the standard editor navigation methods.
  • You can create new markers via the timebar's context menu.
  • You can delete markers via their context menu and via Ctrl+click.
  • MuLab automatically snaps your edits to the zero-crosses in the audio.
  • Alt+click = monitor selection. If nothing is selected it monitors the section between the previous and next markers.

Using an external audio editor

The Audio Lab has only limited DSP functionality because there already are so many good (and free) audio editors on the globe, e.g. Audacity and Wavosaur.

The nice thing is that (on Windows) you can setup this MuTools app so it can work together with one of these audio editors to edit audio streams. (this feature does not yet work for samples). In the main menu -> "Edit Preferences", select the "External Audio Editor" preference, and choose your favorite editor. Now you'll see that when you right-click the audio display in the Audio Lab, you get a context menu option "Edit In Audio Editor", where "Audio Editor" will be the name of your favorite audio editor. Then MuLab stops using this audio file and transfers control over the audio file to the audio editor. Now you can make any edits you want in the audio editor, and save them to the audio file. When you switch back to MuLab, MuLab will notice the changes and propose to re-open the audio file, and update the audio streams to the applied edits.

On MacOS, this automated system does not (yet) work. However MacOS and Windows users can both also reach the same functionality by 'manually' doing completing the following steps:

  • Right-click the audio display in the Audio Lab and choose "Start Editing".

  • Now switch to the other application and start editing the audio file, then save your results.

  • Then switch back to the MuTools app, right-click the audio display in the Audio Lab and choose "End Editing".

All this will have the same effect as the 'automatic' mode.

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