Admixing is all about mixing things together to solve problems—especially communication problems. There are a lot of ways to communicate—many of them haven't even been thought of yet! If you think of a way protos can communicate, or ways they can use existing ways to communicate, or ways existing ways can be improved, then try mixing them together in different combinations to see if they work well together. Sometimes mixing one way of communicating together with others is better than using those same ways separately.
Not all communication methods are best for every type of communication. Sometimes you want to communicate more than one thing at a time, or more than one way at a time, or you may want to communicate something in different contexts, or between different projects, between different times, or spaces, using different technologies. Keep adding and subtracting and mixing and trying out and sharing. See what other protos are working on and have fun!