16. Appendix

16.1. Additional Resources

Got questions? Need more information? Want to contribute? There are a variety of other resources where you can find out more:

16.2. Keyboard mapping table

Shortcuts let you work more efficiently. This table lists the default keyboard shortcuts for accessing Mixxx with an English keyboard layout. Depending on your language settings the defaults may be different.


Deck 1

Deck 2



Crossfade Left


Crossfade Right


Small Crossfade Left

Shift + G

Small Crossfade Right

Shift + H

Activate/Disable Effects Unit



Headphone Cue (Pre-fader listen)



Bass Kill




Load selected track to deck

Shift + left

Shift + right

Unload track from deck

Alt + Shift + left

Alt + Shift + right




Seek Backwards



Reverse Playback

Shift + A

Shift + J

Seek Forwards



Tempo Adjust Down



Tempo Adjust Up



Small Tempo Adjust Down

Shift + F1

Shift + F5

Small Tempo Adjust Up

Shift + F2

Shift + F6

Temporary Tempo Adjust Down



Temporary Tempo Adjust Up



Small Temporary Tempo Adjust Down

Shift + F3

Shift + F7

Small Temporary Tempo Adjust Up

Shift + F4

Shift + F8

Tempo (BPM) Sync



BPM Tap Tempo Adjust

Shift + !

Shift + ^

Cue and Loop

Set Cuepoint

Shift + D

Shift + L




Cue Go-to-and-stop

Shift + F

Shift + :

Activate 4 Beat Loop



Halve Beat Loop Size



Double Beat Loop Size



Set Loop In Point



Set Loop Out Point (Activates Loop)



Toggle Loop On/Off



Set Hot cue 1



Set Hot cue 2



Set Hot cue 3



Set Hot cue 4



Clear Hot cue 1

Shift + Z

Shift + M

Clear Hot cue 2

Shift + X

Shift + <

Clear Hot cue 3

Shift + C

Shift + >

Clear Hot cue 4

Shift + V

Shift + ?


Microphone Talkover


Auto DJ

Shuffle Auto DJ playlist

Shift + F9

Skip next track in Auto DJ

Shift + F10

Fade to next track in Auto DJ

Shift + F11

Toggle Auto DJ on/Off

Shift + F12

Preview Deck

Load Selected Track And Play

Alt + Return



Seek Backwards

Alt + Left

Seek Forwards

Alt + Right

Vinyl Control


Ctrl + J

Ctrl + K

Vinylcontrol Mode

Ctrl + Shift + Y

Ctrl + Shift + U

Vinylcontrol Cueing

Ctrl + Alt+ Y

Ctrl + Alt + U

Single Deck Toggle / Swap Decks

Ctrl + T

Ctrl + T

Search bar


Ctrl + F

Clear input

Ctrl + Back

Exit search and leave focus



Select all files in current list

Ctrl + A

Select group of files in current list

Click first item, hold Shift key, click last item

See also

Mixxx allows you to customize the keyboard shortcuts. For more information, and to download a keyboard mapping image, go to Using a Keyboard.

16.3. Application shortcuts

Use these shortcuts to access features available in the menu on top of the application window.



File menu

Load Track to Deck 1

Ctrl + O

Load Track to Deck 2

Ctrl + Shift + O

Library menu

Add new Playlist

Ctrl + N

Add new Crate

Ctrl + Shift + N

View menu

Show Skin Settings Menu

Ctrl + 1

Show Microphone Section

Ctrl + 2

Show Vinyl Control Section

Ctrl + 3

Show Preview Deck

Ctrl + 4

Show Cover Art

Ctrl + 6

Maximize Library


Full Screen (Windows & Linux)


Full Screen (macOS)

Shift + Command + F

Options menu

Enable Vinyl Control 1

Ctrl + T

Enable Vinyl Control 2

Ctrl + Y

Enable Vinyl Control 3

Ctrl + U

Enable Vinyl Control 4

Ctrl + I

Enable Live Broadcasting

Ctrl + L

Record Mix

Ctrl + R

Enable Keyboard Shortcuts

Ctrl + `

Open Preferences (Windows & Linux)

Ctrl + P

Open Preferences (macOS)

Ctrl + ,

Exit Mixxx

Ctrl + Q

Developer menu

Reload skin

Ctrl + Shift + R

Developer Tools

Ctrl + Shift + T

Stats: Base Bucket

Ctrl + Shift + B

Stats: Experiment Bucket

Ctrl + Shift + E

Debugger Enabled

Ctrl + Shift + D


The Ctrl key on Windows & Linux is equivalent to the Command key on macOS. The Alt key on Windows & Linux is equivalent to the Option key on macOS. Application shortcuts are not customizable.


The Developer menu is available if Mixxx is started using the Command line options.

16.4. Command line options

Mixxx is designed to be as user-friendly as possible. As such, its command line options are only useful for development or debugging, as they make these tasks easier. Command line options are case-sensitive.




Load the specified music file(s) at start-up. Each file you specify will be loaded into the next virtual deck. For a list of supported file types, go to Changing music directories

–resourcePath PATH

Top-level directory where Mixxx will look for its resource files such as MIDI mappings, overriding the default installation location.

–pluginPath PATH

Top-level directory where Mixxx will look for sound source plugins in addition to default locations.

–settingsPath PATH

Top-level directory where Mixxx will look for user settings files such as the library database and preferences configuration file.


Log all controller data Mixxx sends and receives as well as scripts it loads.


Enable developer mode. Includes extra logs, stats on performance and the Developer tools menu as well as tooltips and logs useful for skin developers.


Disable OpenGL widgets (scrolling waveforms, spinnies) to work around GPU driver bugs. If Mixxx is crashing on startup, try using this.

  • Automatically loads empty waveforms

  • Disables spinning vinyl widgets

  • Disables synchronization polling

  • Doesn’t open controllers by default

–locale LOCALE

Use a custom locale for loading translations (e.g fr)

-f, –fullScreen

Start Mixxx in full-screen mode.

–logLevel LEVEL

Set the verbosity of command line logging.

  • critical - Critical/Fatal only

  • warning - Above + Warnings

  • info - Above + Informational messages

  • debug - Above + Debug/Developer messages

  • trace - Above + Profiling messages

–logFlushLevel LEVEL

Set the logging level at which the log buffer is flushed to mixxx.log. LEVEL is one of the values defined at --logLevel above.


Breaks (SIGINT) Mixxx if a DEBUG_ASSERT evaluates to false. A debugger can then be used to continue. This disables the MIXXX_DEBUG_ASSERTIONS_FATAL flag which can otherwise lead to a time consuming full rebuild.

-h, –help

Display this help message and exit

16.5. Developer tools

To start Mixxx in Developer mode from a custom resource directory with MIDI and HID logging enabled, type the following line into the terminal and hit return:

./mixxx --controllerDebug --developer --resourcePath res

16.5.1. Experiment modes for rapid development and testing

  • Adds a static Experiment class with a tri-state mode flag that indicates whether the experiment mode is OFF, BASE, or EXPERIMENT.

  • Adds Developer ‣ Stats:Experiment Bucket and Developer ‣ Stats:Base Bucket. Each one toggles between OFF and BASE/EXPERIMENT so you can choose exactly what time spans you would like to collect in your base and experiment buckets.

  • Updates StatsManager to segment collected stats into a base and experiment bucket. This allows you to quickly measure the difference a code change has on relevant counters / timers within the same execution of Mixxx.

This is useful for quickly enabling and disabling a code change without a re-compile/re-run cycle to get an anecdotal sense of how it “feels” as well as a quantified sense of how it differs in terms of stats Mixxx collects.

All stats collected via the usual Counter/Timer/ScopedTimer/etc. tools are segmented into a BASE STATS and EXPERIMENT STATS section printed to the log on exit.

16.6. Version History

v2.1.0 (2018-04-15)

  • Graphical interface scales for high resolution screens

  • Overhauled Deere and LateNight skins

  • New Tango skin

  • Resizable waveforms

  • Effects are synchronized to the tempo

  • Effects are processed post-fader and post-crossfader and can be previewed in headphones

  • One metaknob per effect with customizable parameter control for intuitive use of effect chains

  • Nine new effects: Autopan, Biquad Equalizer, Biquad Full Kill Equalizer, Loudness Contour, Metronome, Parametric Equalizer, Phaser, Stereo Balance, Tremolo

  • Loaded effects and their parameters are saved and restored when Mixxx restarts

  • More transparent sounding equalizers (Biquad Equalizer and Biquad Full Kill Equalizer)

  • Improved scratching sounds with jog wheels, vinyl control, and dragging waveforms with the mouse

  • Simplified looping and beatjump controls

  • Configurable rows of 8 samplers with up to 8 rows available for a total of 64 samplers

  • Files loaded to samplers are reloaded when Mixxx restarts

  • Improved volume normalization algorithm (EBU-R 128)

  • Filter library table by crates

  • Sort musical keys in library table by circle of fifths

  • Write metadata tags back to audio files

  • New JavaScript library for controller mapping

  • Configure multiple Internet broadcasting stations and use multiple stations at the same time

  • Broadcast and record microphones with direct monitoring and latency compensation

  • Broadcast and record from an external mixer

  • Booth output with independent gain knob for using sound cards with 6 output channels without an external mixer

  • Prevent screensaver from starting while Mixxx is running

  • CUP (Cue And Play) cue button mode

  • Time remaining and time elapsed now take into account the tempo fader

  • Clicking cover art now shows it full size in a separate window

For a full list of new features and bugfixes, go to: https://launchpad.net/mixxx/2.1.

v2.0.0 (2015-12-31)

  • 4 Decks with Master Sync

  • New Effects Framework with 4 Effect Units and 5 Built-in Effects: * Flanger, Bit Crusher, Reverb, Echo, Filter * More to come!

  • Configurable, Resizeable User Interface with 3 Brand New Skins

  • Cover Art Display

  • Music Key Detection and Shifting

  • Vinyl Audio Pass-Through

  • 4 Microphone inputs and 4 Auxiliary inputs

  • MIDI Mapping GUI and Improved Learning Wizard

  • MusicBrainz metadata fetching

  • RGB Musical Waveforms

  • Hundreds of Bug Fixes and Improvements

  • New Pitch-Independent Algorithm for Better-Sounding Key-lock

For a full list of new features and bugfixes, go to: https://launchpad.net/mixxx/2.0.

See also

For an overview of previous versions, take a look at the timeline.