Dimebag used the MXR Flanger/Double throughout his career, starting from around 1991. It can be heard on songs like “Cowboys from Hell” in the intro, on “Slaughtered” and “Hellbound”.
Dime also mentioned using the MXR Flanger/Doubler occasionally on Pantera’s 1996 album, “The Great Southern Trendkill”. Unfortunately, he did not specify anything more than that.
I hooked up my MXR Flanger/Doubler every once in a while and I used an E-Bow for a real smooth, continual sustain on “10’s.”
Dimebag Darrell Discusses Pantera’s 1996 Album, ‘The Great Southern Trendkill’, Guitar World
Dime always had the “Doubler” on in his “wet” amp’s effects loop. The “Flanger” portion was used in the songs mentioned above, but the “Doubler” effect was always on.