Not specifically for the Longitude but what I usually do in such cases is to go to the knob I use for Altitude decrease/increase, create a new local variable (in spad.next) and assign it to the button of that knob. Clicking the button toggles that variable between 0 and 1. Depending on the value of the variable, the altitude knob alternates between 100 and 1000.
I am in touch with devs. at Avsim forum to solve the problem.
Thanks
SOLVED 
I thought mobyFlight worked with scripts like x-touch-mini-fs2020. I didnāt know that you can set up a profile directly with the interface. Iām going to start import my profiles to mobyFlight. Thanks.
A question about xtouch-mini-fs2020: is it possible to add custom Lvars without adding them previously in the event list of mobiflight?
I know this is possible adding them in the mobiflight list, but as it is frequently updated, I donāt want to have to modify it with these custom vars in every update.
Regards
BTW: I know this is easily possible with apps like Mobiflight, Axis and Ohs or Spad, but Iām only interested in this one.
Hi, funny, but since I started using X-touch knobs I also began liking GNS530
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Yes! Using GNS530/430 with knobs (or even G1000) suddenly becomes great fun!
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Hello. I need some help with the configuration of my X-Touch mini with the free software Mobiflight on my PC. I want a cockpit view zoom in and zoom out with the X-Touch fader, but i donāt know how to do it. I mean, there is nothing on the HubHop site. Also the brightness of the cockpit lights would be nice to regulate with the sliderā¦ 
Thanks!
So would a slider to alter the Gamma, for day / night lighting settings 
What do you use to program your X-Touch mini with MSFS ?
Spade Next, AAO , ???
The gamma might need to be done with an extertanl Simconnect exe, talking to your video card ā¦ (assuming you are PC, and not X-box)
For Spad.next I had shown how itās done in Behringer X-Touch mini works flawless - #237 by Zeppos
Not sure how this would translate to Mobiflight though.
Also the brightness of the cockpit lights would be nice to regulate with the slider
This is way more tricky because itāll depend on the aircraft. Each aircraft seems to have its own way to control internal lights for each instrument (or group of instruments), others are using LVARs (like LIGHTING_POTENTIOMETER_x for C152 WBSim JPL), others like the PMDG 737 have their own events, like EVT_LWRMAIN_CAPT_MAIN_PANEL_BRT and so on.
So it can be done but youāll need to experiment and first find out which light is controlled by which variable or event. Then it should be straightforward to assign all these to be controlled by the fader.
You donāt even have to control everything simultaneously with the fader. For example for PMDG 737 (which has tons of lighting settings in the cockpit), Iāve created a set of variables in a Stream Deck:
And clicking each of them sets a different variable in spad.next which can then be used to control everything with just one X-Touch knob (the latter will only change the brightness of whatever Iāve chosen at that time, because I like to have different levels of brightness depending on each item, e.g. a display is different from a background panel light).
Which means that with just one X-touch knob I can control all cockpit lights. The same could be done if I were to use the fader instead of a knob. But for other simpler aircraft (e.g. C152/172 WBSim) Iāll probably assign several X-touch knobs, one for each light.
Again, no idea how/if all this can be translated to Mobiflight, but it should be feasible if you can find the relevant LVARs and events.
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