Numark Mixtrack

This controller as the same as the Numark Mixtrack Pro but without a built-in sound card. It has been discontinued and succeeded by the Numark Mixtrack 3.

Default Mixxx mapping

This mapping is included in Mixxx as of version 1.11.

USB cable
Channel Treble
Channel Mid
Channel Bass
Cue: send the corresponding track to the headphones
Cue Gain: adjust audio level of cue channel
Cue Mix: adjust mix between Cue and Audio out in the headphones.
Browser Knob: help browse through your collection without using a mouse or trackpad
Back: takes you up one level in your file hierarchy
Load A/Load B: Load the highlighted track to the corresponding Deck
Channel faders: control the volume of each channel
Master fader: adjust the output volume of mixxx
Crossfader
Jog Wheels (see below for details)
Scratch mode (see below for details)
Play/Pause
Stutter: press while music is playing to jump back to the cue point
CUE: plays from the cue point if hold. When released, jumps back to the cue point
SYNC: automatically matches the corresponding Deck's tempo to the other Deck's tempo
Pitch Faders
Pitch Bend: when pressed, the pitch will adjust -/+4%, when released, the tempo will set back to the right one
Keylock
View: dynamically set cue point for Deck A
Tick: dynamically set cue point for Deck B
Eq Kill Switches
Effect On/Off: turn on/off the flanger effect
On Deck A: control the Flagner's LFO (unassigned on Deck B)
On Deck A: control the Flagner's Depth and delay (unassigned on Deck B)
Loop Mode: press to alternate between manual or autolooping

   * Manual Looping
     * In: set loop start
     * Out: set loop end
     * Reloop: exit or reenter loop 
   * Auto Looping
     * 1/2 X: devide loop length by 2
     * 1 Bar: make a loop of just one bar (the current one)
     * 2 X: multiply loop length by 2

The jogs

Not in scratch mode

When not in scratch mode, touching the jogs won't pause the song. Turning them will slightly adjust the tempo, which will resume slowly to its speed. This slowness to resume is somehow equivalent to what you would expect from drivebelt turntables. I hate it, and I have not found a way to correct it... This is why I mostly mix using the pitch bend buttons, which allow for an instant resume to the "pitch slider assigned" pitch for the track.

In scratch mode

In scratch mode, touching the jogs will pause the song. The jogs are very sensitive, and allow for scratching and launching tracks on a given moments when "cueing them in your headphones". Be very careful with this: never remain in scratch mode if not needed, you will touch the jogs by error and put your tracks out of sync because one has pause, or worse, produce a "blank".

Known problems

The pitch on the controller has a very short run. Thus, having it configured as a +10/-10 (or more) is tricky because you will get a very low pitch precision. Configuring it as +8/-8 (Mk2 style) is higly recommended
The autolooping functions, altough implemented are quite flawed. The "loop one bar", which is present since the 1.0b version, is making a loop between two bars, which are rarely fitted on real "measures". As of mixxx 1.9, there is no possibility to adjust the bars to make them fit perfectly to the tempo
Pressing play while "cue previewing" should start the track for real, CDJ style. This is not implemented yet, and is marked as a TODO in Mixxx code, so it is unlikely to get implemented on the controller mapping side. *NOTE: If you use the mapping included with the software, this feature is supported. Controls in this mapping are different than the community made one, so be careful.*
Final remark on the hardware design: be very, very careful not to press the "Load A" or "Load B" button, instead of the corresponding track's "cue" button. They are very near, the error is easy and produces the most dire effect in a party: an awful blank !

Virtual DJ-like mapping

This is an alternative mapping designed to work like VirtualDJ. The XML file and JS file are available on GitHub.

USB cable
Channel Treble
Channel Mid
Channel Bass
Cue: send the corresponding track to the headphones
Cue Gain: adjust audio level of cue channel
Cue Mix: adjust mix between Cue and Audio out in the headphones.
Browser Knob: help browse through your collection without using a mouse or trackpad if press change to file browse
Back: change to folder browse or open directories
Load A/Load B: Load the highlighted track to the corresponding Deck
Channel faders: control the volume of each channel
Master fader: adjust the output volume of mixxx
Crossfader
Jog Wheels (see below for details)
Scratch mode (see below for details)
Play/Pause
Stutter: press while music is playing to jump back to the cue point or pause point if not playing work like play button
CUE: plays from the cue point if hold. When released, jumps back to the cue point
Sync: automatically matches the corresponding Deck's tempo to the other Deck's tempo
Pitch Faders
Pitch Bend: when pressed, the pitch will adjust -/+4%, when released, the tempo will set back to the right one
Keylock
Delete: delete hotcue's for Deck A
Delete: delete hotcue's for Deck B
Hotcue: control hotcue's 1, 2 and 3
Effect On/Off: turn on/off the flanger effect
Select: select effect and if press change the output of effect
Control: control the filter and gain
Loop Mode: press to alternate between manual or autolooping

   * Manual Looping
     * In: set loop start
     * Out: set loop end
     * Reloop: exit or reenter loop 
   * Auto Looping
     * 1/2 X: devide loop length by 2
     * 1 Bar: exit or reenter loop
     * 2 X: multiply loop length by 2

Options

The options is set in the javascript file on the property root.options.

loopBackMode

Select, when a loop is set by number of beats ('loop 4'), if the loop starts from the current position (false) or ends at the current position (true). Smart means set start when paused o set end when playing. This function work in autolooping mode only.