366         self.slider=[None]*len(self.filter_state.frequencies)
367         self.label=[None]*len(self.slider)
372         def add_slider(slider,label, c):  argument
373             self.layout().addWidget(slider,0,c,qt.AlignHCenter)
375 …     self.layout().setColumnMinimumWidth(c,max(label.sizeHint().width(),slider.sizeHint().width()))
377             slider=QtWidgets.QSlider(QtCore.Qt.Vertical,self)
379             slider.setRange(-1000,2000)
380             slider.setSingleStep(1)
381             return (slider,label)
385             slider,label=create_slider(self.hz2label(hz))
386             self.slider[i]=slider
390             add_slider(slider,label,i+1)
401         def connect(writer,reader,slider,label):  argument
402             slider.valueChanged.connect(writer)
404             label_cb=partial(slider.setValue,0)
414         self.writer_callbacks=[None]*len(self.slider)
415         self.reader_callbacks=[None]*len(self.slider)
417         for i in range(len(self.slider)):
422                     self.slider[i],
425         def disconnect(writer,reader,label_cb,slider,label):  argument
426             slider.valueChanged.disconnect(writer)
431         for i in range(len(self.slider)):
435                     self.slider[i],
451         slider=self.slider[i]
452         slider.blockSignals(True)
453         slider.setValue(self.coef2slider(math.sqrt(2.0)*self.filter_state.coefficients[i]))
454         slider.blockSignals(False)