i think what you want depends on the midi device, i had the same issue with my midi arturia. can you try it with another?
im not sure i understand what you want, but if its somehow write a default value to an array perhaps you can have it as saved file, and load it then write it into an array in i-rate. (thats what i did)
i hope that helps if not please explain more. but i guess the answer is not with opcodes.