supercollider

Debugging Supercollider OSCresponderNode

Anyone have an idea how to debug supercollider's OSCresponderNode? I'm trying to catch messages from another program with this : o = OSCresponderNode(nil, '/note', { arg t, r, msg; t.postln; r.postln; msg.postln; Synth( "guru2", [\mfreq, msg[1]]); }).add; However, when I fire messages at it, supercollider is just giving me FAILURE...