In this video tutorial, I will show you how to merge & insert multiple tracks into a single track in the Audacity audio editor.
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Mixing refers to the process of combining multiple Audacity tracks which play simultaneously into a single track.

Audacity mixes automatically when playing or exporting, but it can also physically mix selected multiple tracks together into one within the project.

The channel of a track being mixed affects whether it will be mixed into the left channel of the resulting track(s), the right channel, or both (mono). For example, if you have four tracks:

Track 1: left channel
Track 2: left channel
Track 3: right channel
Track 4: mono channel

and you select them all and perform a Mix and Render, you will end up with one stereo track: the left channel will contain a mix of tracks 1, 2, and 4 and the right channel will contain a mix of tracks 3 and 4.

Mixing can be done for a number of reasons, for example mixing speech with background music to make a podcast, or adding different instruments into the same song. Concatenating songs (for example, playing three songs one after the other) does not necessarily involve mixing, but if you wanted the songs to fade into each other it would involve mixing.

Within an Audacity project, you can physically mix selected multiple selected tracks into a single mono or stereo track using either of two explicit mix commands:

Tracks / Mix and Render (which replaces the original track(s) with the mixed track) or
Tracks / Mix and Render to New Track (which adds the mixed track to the project, preserving the original tracks).

However in Audacity, mixing is automatic. You could just put audio into two different tracks, play to listen to the result then export it as an audio file like MP3 or WAV or burn the WAV to Audio CD.

However once audio has been finally mixed (as in an audio file you might import into Audacity) it is essentially impossible to separate out all the original parts again; it's like trying to take the banana out of a banana milkshake after you've already put it through the blender. There are a few occasions when it actually is possible to separate sounds a bit - you can sometimes isolate the bass, or remove the lead vocals. But these processes don't always work well and usually cause some quality loss. So remember, as long as the multiple tracks are inside an Audacity project, you can manipulate them independently, but once you export as a mixed down file you can't expect to separate the different parts again. So keep your Audacity project around if you plan to continue editing!
Muting and Soloing

When working with multiple tracks, it's often important to be able to hear just one at a time. Each track has a Mute and a Solo button, allowing you to temporarily hear just some of your tracks - see the figure above

Mute causes a track to be silenced. More than one track can be muted.
Solo can behave in two different ways depending on the setting made in Tracks Preferences.
Default behavior is that Solo silences all of the tracks except the ones being soloed. More than one track can be soloed, and soloing overrides muting.
Alternative behavior is that only one track can be soloed at a time. Soloing still overrides muting.

A third option in Tracks Preferences is to hide the Solo button from tracks, leaving just a Mute button which silences whichever tracks it is applied to.

You can press the Mute and Solo buttons while tracks are playing.

If you're using the keyboard, SHIFT+U toggles muting on the currently focused track which has the yellow border, and SHIFT + S toggles soloing. The solo shortcut works even if you hide the Solo button.

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