One more thing.
Read the Manual of the software.
BTW I quote the section that discribes the Flanger:
• the dry/wet is in fact replaced by an effect level whose value is 0% at min
amount value and increases till 100% at the max amount value.
• flanger uses a small feedback range: the minimum feedback value is 50% and
it increases up to 66%.
• the LFO of the flanger effect uses a saw-tooth waveform (always falling) and
the oscillation cycle is dependent on the current playback Bpm. turning the
Amount knob clockwise selects the following values: 1, 2, 4, 8, and finally 16
beats.