Python : Lock in amplifier : how to set local oscillator's amplifier?

I have solved the problem. Like this .!!

1st. problem :
i.set_filter(100, slope=‘Slope18dB’, strict=False)

2nd problem:
i.set_aux_output(500, 0.2) <— Even if the output mode is demod, the amplitude value is controlled with set_aux_ouput.