I made a video of the test I did with the hydraulic pump motor. The motor, when switched on, starts at a low rpm. When the sticks are used, the motor rpm increases.
I enabled the 2 mix modes of the spektrum dx6i and linked them to the arm and boom position. Ideally I would need a 3rd mix mode for the bucket operation. Not sure how allow to increase the motor rpm when only operating the bucket curl.
I also finished the arm and boom for painting: