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If you connect the rigging line to the MA system with a prussik, you can really use a pre-set compound system, because you put the prussik at the right place to match the MA's length. You have to set it each time if you try to lift loads with only the MA system. One day pull out the engine off...

The TreeSpyder is speeder than me !:cry: I let fall my first answer. The pulleys have only one purpose: they change the direction of the rope. With the less loss of energy as possible. Like that, one rope makes several times the same work, each one is added into the system, like there were...

In this setup, you just have to count the number of ropes which hold the load. As in your pic, if the load is on the lower point to lift it, it's held by 4 pieces of ropes. The 4 ropes hold the load each with the same amount of force you put on the free rope. So it gives you a 4:1. If you...