Company Wishes to Adjust Role, Responsibility and Pay on Employment Contract

I signed an employment contract to be Chief Operating Officer of a start-up company. I am still employed there earning a substantial salary. My contract does not spell out my job responsibilities, instead referencing the LLC Agreement for our company. The CEO wishes to cut my salary nearly in half. My wife and I relocated as a result of this contract and kept our home in our former state. This salary reduction would result in not being able to afford rent plus mortgage and seems to violate the contract. What specific rights do I have to review the contract in light of what they are asking? Should I not insist on maintaining my current salary and if they wish to terminate then benefit from the 12 months salary promised in the contract if they terminate me without cause (it is specific about cause being comitting a crime or something similar).