Second  hand 
This effect is best heard in the subtle beats that Mister David Gilmour has been using for decades (as of Animals) for his divine lead sound. The automatic sweep can be disabled in the "Filter Matrix Mode", and you can manually adjust at what stage of the flanging effect should "stand still" compared to a set Wah Wah (but of course a very different sound!).
In order to meet modern demands, the flanger can also be activated in combination with a chorus effect - naturally coming out in stereo.
Digital effect with an analog sound
No background noises
Filter Matrix Mode
Stereo