15.1 The Live Mixer
Live includes a mixer section that is accessible from two views:
In the Arrangement View, the mixer appears as a horizontal strip to the right of the track area. To display all mixer controls for a track, unfold the track using the button next to its name, and adjust its height accordingly.
The Session View is a standard vertical mixer layout, which you may find more intuitive than the Arrangement mixer. Note that the Tab key toggles between the Arrangement and Session Views if you’re working with a single window. If you’re working with two windows, the Tab key swaps the Arrangement and Session between the windows, which allows you to see your Arrangement while using the Session mixer.
The View menu options listed below show or hide mixer components. You can use different mixer view setups in the Session View and in the Arrangement View:
- Track Delays
The Mixer Section selectors on the right-hand side of the screen duplicate the View Menu commands, making it possible to quickly show or hide different mixer components.
Let’s look at the mixer controls:
- The Meter shows both peak and RMS output levels for the track. While monitoring, however, it shows peak and RMS input levels. Peak meters show sudden changes in level, while RMS meters give a better impression of perceived loudness.
- The Volume control adjusts the track’s output level. With multiple tracks selected, adjusting the volume of one of them will adjust the others as well.
- The Pan control positions the track’s output in the stereo field. To reset the Pan control to center, click on its associated triangle. With multiple tracks selected, adjusting the pan knob for one of them will adjust the others as well.
- To mute the track’s output, turn off the Track Activator switch. With multiple tracks selected, toggling one of their Track Activators will toggle the others as well.
- The Solo switch solos the track by muting all other tracks, but can also be used for cueing (see 15.6). With multiple tracks selected, pressing any of their Solo switches will solo all of them. Otherwise, tracks can only be soloed one at a time unless the CTRL(PC) / CMD(Mac) modifier is held down or the Exclusive Solo option in the Record/Warp/Launch Preferences is deactivated.
- If the Arm Recording button is on, the track is record-enabled (see Chapter 16). With multiple tracks selected, pressing any of their Arm switches will arm all of them. Otherwise, tracks can only be armed one at a time unless the CTRL(PC) / CMD(Mac) modifier is held down or the Exclusive Arm option in the Record/Warp/Launch Preferences is deactivated. With Exclusive Arm enabled, inserting an instrument into a new or empty MIDI track will automatically arm the track.
15.1.1 Session Mixer Features
The Mixer section of the Session Mixer has several additional features that are not visible by default. The mixer is resizable, and dragging upwards on the top of the mixer will extend the height of the track meters, adding tick marks, a numeric volume field and resettable peak level indicators. Increasing a track’s width in this state will add a decibel scale alongside the meter’s tick marks.
These enhancements are tailored for use in traditional mixing settings, but are available anytime the Mixer section is displayed.
Because of the enormous headroom of Live’s 32-bit floating point audio engine, Live’s meters can be driven far “into the red“ without causing the signals to clip. The only time that signals over 0 dB will be problematic is when routing to or from physical inputs and outputs, like those of your sound card, or when saving audio to a file.
Nevertheless, Live provides this optional visual feedback for signals that travel beyond 0 dB in any track.
15.2 Audio and MIDI Tracks
Audio and MIDI tracks in Live are for hosting and playing clips, as explained earlier (see Chapter 4).
You can add new audio and MIDI tracks to your Live Set’s mixer using the appropriate Create menu commands.
Tracks can also be created by double-clicking or pressing Enter on files in the browser to load them, or by dragging objects from the Browser into the space to the right of Session View tracks or below Arrangement View tracks. Devices or files loaded into Live in this manner will create tracks of the appropriate type (e.g., a MIDI track will be created if a MIDI file or effect is dragged in).
A track is represented by its track title bar. You can click on a track title bar to select the track and then execute an Edit menu command on the track. One such command is Rename. One can quickly rename a series of tracks by executing this command (or the Rename shortcut CTRL-R(PC) / CMD-R(Mac)) and then using the Tab key to move from title bar to title bar. When a # symbol precedes a name, the track will get a number that updates automatically when the track is moved. Adding additional # symbols will prepend the track number with additional zeros. You can also enter your own info text (see 2.1.1) for a track via the Edit Info Text command in the Edit menu or in the tracks’s right-click(PC) / CTRL-click(Mac) context menu.
You can drag tracks by their title bars to rearrange them, or click and drag on their edges to change their width (in the Session View) or height (in the Arrangement View).
Multiple adjacent or nonadjacent tracks can be selected at once by Shift-clicking or CTRL-clicking, respectively. If you drag a selection of nonadjacent tracks, they will be collapsed together when dropped. To move nonadjacent tracks without collapsing, use CTRL + arrow keys instead of the mouse.
When multiple tracks are selected, adjusting one of their mixer controls will adjust the same control for the other tracks. If the tracks in the multi-selection have differing values for any particular knob or slider parameter (volume, for example), this difference will be maintained as you adjust the parameter.
If you drag a track’s title bar to the Browser it will be saved as a new Set. If a track contains audio clips, Live will manage the copying of the referenced sampled into this new location based on the selection in the Collect Files on Export chooser (see 5.8.1). You can then type in a name for the newly created Set or confirm the one suggested by Live with Enter.
Tracks are deleted using the Edit menu’s Delete command.
15.3 Group Tracks
You can combine any number of “normal“ audio or MIDI tracks into a special kind of summing container called a Group Track. To create a Group Track, select the tracks to include and execute the Edit menu’s Group Tracks command.
Group Tracks cannot contain clips, but they are similar to audio tracks in that they have mixer controls and can host audio effects. Group Tracks provide a quick way to create submixes (see “Creating Submixes”), and also offer the ability to fold and unfold their contained clip tracks via the button in the title bar. This can help you to organize large Sets by hiding away tracks that you don’t need to see.
When tracks are placed into a group, their Audio To routing choosers (see 14.6) are automatically assigned to “Group“ unless they already had a custom routing (i.e. to a destination other than “Master.“) You can also use a Group Track purely as a “folder“ track by rerouting the outputs of the contained tracks to some other destination.
Once a Group Track has been created, tracks can be dragged into or out of the group. Deleting a Group Track deletes all of its contents, but a group can be dissolved back into individual tracks by executing the Edit Menu’s Ungroup Tracks command.
Group Tracks in Arrangement View show an overview of the clips in the contained tracks. In Session View, slots in Group Tracks have launch and stop buttons whenever at least one clip is available in a given scene. Launching or stopping this button has the same effect as launching or stopping all contained clips. Likewise, selecting a Group Slot serves as a shortcut for selecting all of the contained clips.
15.4 Return Tracks and the Master Track
In addition to Group Tracks and tracks that play clips, a Live Set has a Master track andreturn tracks; these cannot play clips, but allow for more flexible signal processing and routing.
The return tracks and the Master track occupy the right-hand side of the Session mixer view and the bottom end of the Arrangement View.
Note that you can hide and show the return tracks using the Returns command in the View menu.
Like the “normal“ clip tracks, the returns and the Master can host effects devices. However, whereas a clip track’s effect processes only the audio within that track, return tracks can process audio sent to them from numerous tracks.
For example, suppose you want to create rhythmic echoes with a delay effect. If you drag the effect into a clip track, only clips playing in this track will be echoed. Placing this effect in a return track lets it receive audio from any number of tracks and add echoes to them.
A clip or group track’s Send control regulates how much of the track’s output feeds the associated return track’s input. What’s more, even the return track’s own output can be routed to its input, allowing you to create feedback. Because runaway feedback can boost the level dramatically and unexpectedly, the Send controls in Return tracks are disabled by default. To enable them, right-click(PC) / CTRL-click(Mac) on a Return track’s Send knob and select Enable Send or Enable All Sends.
Every return track has a Pre/Post toggle that determines if the signal a clip track sends to it is tapped before or after the mixer stage (i.e., the pan, volume and track-active controls). The “Pre“ setting allows you to create an auxiliary mix that is processed in the return track, independently of the main mix. As the return track can be routed to a separate output, this can be used to set up a separate monitor mix for an individual musician in a band.
The Master track is the default destination for the signals from all other tracks. Drag effects here to process the mixed signal before it goes to the master output. Effects in the Master track usually provide mastering-related functions, such as compression and/or EQ.
You can create multiple return tracks using the Create menu’s Insert Return Track command, but by definition, there is only one Master track.
15.5 Using Live’s Crossfader
Live includes a crossfader that can create smooth transitions between clips playing on different tracks. Live’s crossfader works like a typical DJ-mixer crossfader, except that it allows crossfading not only two, but any number of tracks — including the returns.
The crossfader is accessed via the Session View’s mixer selectors. It features seven different crossfade curves so that you can choose the one that fits your style the best. To change the curve, right-click(PC) / CTRL-click(Mac) on the crossfader, then select an entry from the context menu.
The chart below details the power level and response of each crossfader curve.
The crossfader can be mapped to any continuous MIDI controller (absolute or incremental) (see Chapter 26). In addition to the crossfader’s central slider, its absolute left and right positions are separately available for MIDI or keyboard mapping. There are two special scenarios for remote control with respect to the crossfader:
- A key mapped to any one of the three assignable crossfader positions (left, center or right) will toggle the crossfader’s absolute left and right positions.
- Mapping to two of the three fields allows for a “snapping back“ behavior when one of the assigned keys is held down and the other is pressed and released.
Each track has two Crossfade Assign buttons, A and B. The track can have three states with respect to the crossfader:
- If neither Assign button is on, the crossfader does not affect the track at all.
- If A is on, the track will be played unattenuated as long as the crossfader is in the left half of its value range. As the crossfader moves toward the right across the center position, the track fades out. At the crossfader’s rightmost position, the track is muted.
- Likewise, if B is on, the track’s volume will be affected only as the crossfader moves left across its center position.
It is important to understand that the Crossfade Assign buttons do not affect the signal routing: The crossfader merely influences the signal volume at each track’s gain stage. The track can be routed to an individual output bus regardless of its crossfade assignment. In studio parlance, you can think of the crossfader as an on-the-fly VCA group.
As with almost everything in Live, your crossfading maneuvers can be recorded into the Arrangement (see Chapter 19) for later in-depth editing. To edit each track’s crossfade assignment, please choose “Mixer“ from the Envelope Device chooser and “X-Fade Assign“ from the Control chooser. The crossfader’s automation curve is accessible when “Mixer“ is chosen from the Master track’s Device chooser and “Crossfade“ is selected from its Control chooser.
15.6 Soloing and Cueing
By default, soloing a track simply mutes all other tracks (except in some cases where tracks are feeding other tracks (see 14.6)). The signal from the soloed tracks is heard through their respective outputs, with the pan setting of each track preserved. Soloing a clip track leaves any return tracks audible, provided that the Solo in Place option is enabled in the Solo button’s right-click(PC) / CTRL-click(Mac) context menu. Solo in Place can also be set as the default behavior by selecting the entry in the Options menu.
Soloing a return track mutes the main output of all other tracks, but still allows you to hear any signals that arrive at the return via track sends.
Live allows you to replace the standard soloing operation with a cueing operation that lets you preview tracks as though you were cueing a record on a DJ mixer. This allows choosing clips and adjusting effects without the audience hearing, before bringing tracks into the mix.
In order to set Live up for cueing, you must be using an audio interface with at least four dedicated outputs (or two dedicated stereo outputs). The respective settings are accessible in the Session View mixer. Make sure you have the Mixer and In/Out options checked in the View menu.
- The Master Out chooser selects the output on your interface to be used as the main output.
- The Cue Out chooser selects the output on your hardware interface to be used for cueing. This has to be set to an output other than that selected for the Master. If the desired outputs don’t show up in these choosers, please check the Audio Preferences.
- Activate cueing by setting the Solo/Cue Mode switch to “Cue.“
- The tracks’ Solo switches are now replaced by Cue switches with headphone icons. When a track’s Cue switch is pressed, that track’s output signal will be heard through the output selected in the Cue Out chooser. Note that the Track Activator switch on the same track still controls whether or not the track is heard at the Master output.
- The Cue Volume control adjusts the volume of the cueing output.
Note that when cueing is set up and activated, the output of audio files that you are previewing in the browser is also heard through the Cue Out.
15.7 Track Delays
A Track Delay control is available for every track in Live. The control allows delaying or pre-delaying the output of tracks in milliseconds in order to compensate for human, acoustic, hardware and other real-world delays.
This section of the interface can be shown or hidden using its respective Mixer Section selector.
We do not recommend changing track delays on stage, as it could result in undesirable clicks or pops in the audio signal. Micro-offsets in Session View clips can be achieved using the nudge buttons in the Clip View (see 8.1.5), however track delays can be used in the Arrangement View for such offsets.
Note that delay compensation for plug-ins and Live devices is a separate feature (see 17.5), and is automatic by default. Unusually high Track Delay settings or reported latencies from plug-ins may cause noticeable sluggishness in the software. If you are having latency-related difficulties while recording and playing back instruments, you may want to try turning off device delay compensation, however this is not normally recommended. You may also find that adjusting the individual track delays is useful in these cases. Note that the Track Delay controls are unavailable when device delay compensation is deactivated.