What the 'Wah' does is that it changes the Bass to Treble-or vice versa, depending where your at-on the press of a pedal, and the flanger takes a little time. There is slow and fast Flanger, but the Flanger cannot make the ' Wah' sound. With Tremolo, these two effects combinded will rock. Songs that have Flanger: Blink-182 - Obvious-the verse-, Asthenia-when the guitars some in, verse-, Here's you letter-intro-, Feeling This-intro, even percussion have flanger-.