Default Emulating touch input from volume rocker

I hope this is the correct place to make this thread.. If not let me know.
I am just playing modern combat 4 and I don't want to use a gamepad but I would really like to be able to use the volume rocker as a trigger. In essence I need an app or method that allows me to set the volume rocker to emulate touch input at a given (x,y) point on my screen

Thanks lots guys I have not been able to finds this anywhere else exactly as I need it.

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