if song != self.currentSong:

                    self.currentSong = song

                    # this may be piling on the handlers

                    self.graph.addHandler(self.setEffects)

                if song is None:

                    return

                outSubs = []

                for e in self.currentEffects:

                    outSubs.append(e.eval(songTime))

                out = Submaster.sub_maxes(*outSubs)

                dmx = out.get_dmx_list()

                if log.isEnabledFor(logging.DEBUG):

                    log.debug("send dmx: %r", out.get_levels())

                with self.stats.writeDmx.time():

                    yield dmxclient.outputlevels(dmx, twisted=True)

                elapsed = time.time() - t1

                dt = max(0, self.period - elapsed)

        except Exception:

            traceback.print_exc()

            dt = 1

        reactor.callLater(dt, self.sendLevels)

class App(object):

    def __init__(self, show):

        self.show = show

        self.graph = SyncedGraph("effectEval")

        self.graph.initiallySynced.addCallback(self.launch)

        self.stats = scales.collection('/',

                                       scales.PmfStat('sendLevels'),

                                       scales.PmfStat('getMusic'),

                                       scales.PmfStat('writeDmx'),

                                       scales.IntStat('errors'),

                                       )

    def launch(self, *args):

        self.loop = EffectLoop(self.graph, self.stats)

        SFH = cyclone.web.StaticFileHandler

        self.cycloneApp = cyclone.web.Application(handlers=[

            (r'/()', SFH,