What function or file in source code controls mixing/output?

What function or file in source code controls mixing and output?

I can not find answer to my question Increase min/max travel zone for servos

I found
github.com/diydrones/ardupilot/ … titude.pde

Is it correct file?

github.com/diydrones/ardupilot/ … e.pde#L978

    channel_roll->output();
    channel_pitch->output();
    channel_throttle->output();
    channel_rudder->output();
    RC_Channel_aux::output_ch_all();

I have Delta Wing.
I setup like here

code.google.com/p/ardupilot-meg … M2RC?wl=en

channel_roll - left servo?
channel_pitch - right servo?

Is final values?

PS Can’t embed image as it too big
wiki.ardupilot-mega.googlecode.c … _PLANE.jpg