I recommend learning on the base factory configuration and avoiding accessories or aftermarket modifications until you have some experience with your rebreather. Divers new to rebreathers often develop the idea that there are many needed 'improvements' to the factory configuration for their chosen rebreather. The base unit is pretty much complete, you need only add your choice of cylinders, harness, wing, and bailout to be ready to dive. Go slow, build experience and then gradually make additions or modifications.
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