In Garageband and Logic there is a stereo flanger preset where the left channel flange moves up while the right channel flange moves down and vice-versa. I'd call it dual inverse stereo flanging if I had to give it a name. Anyway, it's a super cool effect. Does anyone know of a stereo flanger pedal that can duplicate this effect? It would be nearly impossible to achieve this by running two identical flangers in stereo and trying to set the rate controls so that they would continue to run in this inverse up and down flanging mode as they would surely start slipping out of their inverse sync after a while. Hope I've made all this clear. Thanks in advance for your time guys!