Four?!!! Quadraphonic goodness. Run different delays to each speaker. Use two delay blocks into two output blocks and set all the times a bit different.
I’ve been toying with the idea of running my show in quadraphonic just to needlessly further complicate my life. This isn’t helping to talk me out of it.
I saw Emerson Lake and Palmer in the 70’s and when they kicked in the quadraphonic in the arena it modified my DNA.
i synchronize my entire show with Qlab so it would be doable.