for w in self.master.winfo_children():

            w.destroy()

        stage_tl = toplevelat(65,37)

        s = stage.Stage(stage_tl)

        stage.createlights(s)

        s.pack()

        sub_tl = toplevelat(0,0)

        effect_tl = toplevelat(462,4)

        self.xfader = Xfader(self.scalelevels)

        self.subpanels = Subpanels(sub_tl, effect_tl, self.scalelevels, Subs, 

            self.xfader, self.changelevel)

        leveldisplay_tl = toplevelat(873,400)

        leveldisplay_tl.bind('<Escape>', sys.exit)

        leveldisplay = Leveldisplay(leveldisplay_tl, self.channel_levels)

        Console()

        # root frame

        xf=Frame(root)

        xf.pack(side='right')

        root.bind('<r>', self.refresh)

        leveldisplay_tl.bind('<r>', self.refresh)

        self.xfader.setupwidget(xf)

        controlpanel.pack()

    def refresh(self, *args):

        'rebuild interface, reload data'

        get_data()

        self.buildinterface()

    # this is called on a loop, and ALSO by the Scales

    def changelevel(self, *args):

        'Amp trims slider'

        levels = [0] * 68

        for name, s in Subs.subs.items():

            newlevels = s.get_levels(level=self.scalelevels[name].get())

            for (ch, fadelev) in newlevels.items():

                levels[ch-1] = max(levels[ch-1], fadelev)

        levels = [int(l) for l in levels]

        for lev,lab,oldlev in zip(levels, self.channel_levels, self.oldlevels):

            if lev != oldlev:

                lab.config(text="%d" % lev)

                colorlabel(lab)

        self.oldlevels = levels[:]

        parportdmx.sendlevels(levels)

    def load(self):

        try: