Hum.....
I was hoping that the taper on the two belt pulleys would cause the drive belt to shift from one side to the other side when the direction changes. What actually happens is the belt (rubber band) walks to one side and stays there no matter the direction of rotation.
I was going to use this setup to give alternating speed to the cable drums for each direction. That way I could go to two drums instead of one, and the slack issue would be managed by the taper drums.
If it worked, I was going to use a longer shaft on each axel and drive the cable drums from the extensions.
Jim