How to use the pyo.SndTable function in pyo

def _enter(self):
        super(SoundFile, self)._enter()
        global _got_pyo
        default_init_audio_server()

        self._sound_start_time = None
        self._sound_stop_time = None
        self.__snd = None
        if _got_pyo:
            # init the sound table (two steps to get mono in both speakers)
            sndtab = pyo.SndTable(initchnls=_pyo_server.getNchnls())
            sndtab.setSound(path=self._filename, start=self._start,
                            stop=self._stop)

            # set the end time
            if not self._loop:
                self.cancel(self._start_time + sndtab.getDur())

            # read in sound info
            self.__snd = pyo.TableRead(sndtab, freq=sndtab.getRate(),
                                       loop=self._loop,
                                       mul=self._volume)
            if self.__snd is None:
                raise RuntimeError("Could not load sound file: %r" %
                                   self._filename)

            # schedule playing the sound

def load_file(self):
        # load file to sound table
        print(self.path)
        sys.stdout.flush()
        self.snd_table = pyo.SndTable(self.path, chnl=2)
        self.table = pyo.TableRead(self.snd_table, freq=self.snd_table.getRate(),
                                   loop=False, mul=self.amplitude)

envelope = pyo.Sine(freq=soundParams['modFrequency'],
                                mul=halfAmp,
                                add=halfAmp,phase=0.75)
            soundObj = pyo.Fader(fadein=self.risetime, fadeout=self.falltime,
                                 dur=soundParams['duration'], mul=envelope)
            soundwaveObj = pyo.Noise(mul=soundObj).out()
            return(soundObj,[envelope,soundwaveObj])
            '''
            soundObj = pyo.Fader(fadein=self.risetime, fadeout=self.falltime,
                                 dur=soundParams['duration'], mul=soundAmp)
            envelope = pyo.Sine(freq=soundParams['modFrequency'],mul=soundObj,add=soundAmp,phase=0)
            soundwaveObj = pyo.Noise(mul=envelope).out()
            return(soundObj,[envelope,soundwaveObj])
            '''
        elif soundParams['type']=='fromfile':
            tableObj = pyo.SndTable(soundParams['filename'])
            samplingFreq = tableObj.getRate()
            if soundParams.get('duration'):
                duration = soundParams['duration']
            else:
                duration = tableObj.getDur()
            if soundParams.get('channel')=='left':
                fs = [samplingFreq,0]
            elif soundParams.get('channel')=='right':
                fs = [0,samplingFreq]
            else:
                fs = 2*[samplingFreq]
            soundObj = pyo.Fader(fadein=self.risetime, fadeout=self.falltime,
                                 dur=duration, mul=soundAmp)
            print duration
            print fs
            soundwaveObj = pyo.Osc(table=tableObj, freq=fs, mul=soundObj).out()

def _setSndFromFile(self, fileName):
        # want mono sound file played to both speakers, not just left / 0
        self.fileName = fileName
        self._sndTable = pyo.SndTable(initchnls=self.channels)
        # in case a tone with inf loops had been used before
        self.loops = self.requestedLoops
        # mono file loaded to all chnls:
        try:
            self._sndTable.setSound(self.fileName,
                                    start=self.startTime, stop=self.stopTime)
        except Exception:
            msg = (u'Could not open sound file `%s` using pyo; not found '
                   'or format not supported.')
            logging.error(msg % fileName)
            raise TypeError(msg % fileName)
        self._updateSnd()
        self.duration = self._sndTable.getDur()

def _setSndFromFile(self, fileName):
        # want mono sound file played to both speakers, not just left / 0
        self.fileName = fileName
        self._sndTable = pyo.SndTable(initchnls=self.channels)
        # in case a tone with inf loops had been used before
        self.loops = self.requestedLoops
        # mono file loaded to all chnls:
        try:
            self._sndTable.setSound(self.fileName,
                                    start=self.startTime, stop=self.stopTime)
        except Exception:
            msg = ('Could not open sound file `%s` using pyo; not found '
                   'or format not supported.')
            logging.error(msg % fileName)
            raise TypeError(msg % fileName)
        self._updateSnd()
        self.duration = self._sndTable.getDur()