Simple mixer for multicopters


My friends and I are trying to make a stabilizing unit. It looks like a quadcopter with propellers facing horizontally outward. The idea is to make it so that the pitch signal can make it go back and forth, roll right and left.

Since there’s no need for a push in both opposite directions, instead of a regular multirotor mixer, we want to use a simple mixer that filters out the negative/positive input.

However, we got no output using this mixer.

Any suggestions?