What worked for me was to set it this way:
let modTarget = superdirtTarget {oName = "SuperDirtMod", oAddress = "127.0.0.1", oPort = 57130 }
oscSet = OSC "/set" $ Named {required = []}
modMap = [(modTarget, [oscSet])]
mod <- startStream defaultConfig modMap
What worked for me was to set it this way: