When Momentary CC mode is enabled the Midi Fighter arcade buttons will send both Note & Control Change messages. This is useful when using the device in Ableton as it allows you to map momentary control of FX to the arcade buttons, compared to Note On messages which will only provide toggle control. You can toggle between the two in the Midi Fighter Utility. By setting the software mode to Ableton Mode for the Classic/Pro/3D, or enabling "Momentary CC's" for the Spectra. When this option is enabled the Midi Fighter arcade buttons will send both Note & Control Change messages. This is useful when using the device in Ableton as it allows you to map momentary control of FX to the arcade triggers, compared to Note On messages which will only provide toggle control.
You can see an example of the MIDI data sent following a button press and release below.
Traktor Mode - Momentary Disabled
15:19:34.201 From Midi Fighter 3D Note On 3 C3 127
15:19:34.235 From Midi Fighter 3D Note Off 3 C3 127
Ableton Mode - Momentary Enabled
15:19:36.416 From Midi Fighter 3D CH4 CC#48 127
15:19:36.417 From Midi Fighter 3D CH3 Note On C3 127
15:19:37.113 From Midi Fighter 3D CH4 CC#48 0
15:19:37.114 From Midi Fighter 3D CH3 Note Off C3 0