The M-Audio FastTrack Pro has a switch labeled A/B that toggles the 
headphone jack between channels 1-2 and 3-4. Try pressing that switch.

On 12/18/2015 3:17 PM, RJ Ryan wrote:
> Hi Francesco,
>
> In order to get you a faster response I'm looping in mixxx-devel who may
> have some ideas. I'll take a look at your question when I have some free
> time this weekend.
>
> cheers,
> RJ
>
> On Fri, Dec 18, 2015 at 4:00 AM, francesco martini
> <martini.francesc...@gmail.com <mailto:martini.francesc...@gmail.com>>
> wrote:
>
>     Hi Ryan and sorry to bother you again.
>     I am setting Mixxx on my Macbook but I have a problem with
>     pre-listening: while one songs passes through the speakers, the other
>     one is ready in the prelistening section, I click on Play, LEDs work
>     but no sound in my headphones (yes the headphone button on the
>     Mixtrack 3 for the other song is activated).
>
>     My soundcard is an M-Audio FastTrack Pro and the settings for Mixxx are:
>
>     Main => Ch1-2
>     Headph => Ch3-4
>
>     I have also tried to invert the channels but nothing happens..am I
>     doing wrong?
>
>     Thank you,
>     Regards
>
>     Francesco from Brussels
>
>
>
>
> ------------------------------------------------------------------------------
>
>
>
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