Background: Aaron Turner (born November 5, 1977) is an American musician, singer, graphic artist, and founder of label Hydra Head Records. He is most widely known for his role as guitarist and vocalist for the post-metal band Isis, while also participating in several other bands and projects such as Old Man Gloom, Lotus Eaters and Split Cranium, a collaboration with Jussi Lehtisalo of Finnish band Circle who toured with Isis in 2009. Though raised in New Mexico, Turner moved to the Boston area where he attended school and formed Isis and Hydra Head. In June 2003, Turner moved operations of both the band and label to Los Angeles, California.
Context: Touring with Isis in 2007, Turner used two different guitars: a 1976 Fender Telecaster Custom (black), and a 1975 Fender Telecaster Deluxe (brown), played through various effects (his pedalboard layout changed every gig depending on what songs the band decided to play that night), a VHT/Fryette Pitbull Ultra Lead, and two 4x12 Sunn cabinets. He has also acquired a custom guitar from the Electrical Guitar Company (as did fellow Isis guitarist Michael Gallagher).  In the past, Turner has also used a Gibson Les Paul Standard, PRS CE24, and has played through Sunn, Mesa Boogie, and Mackie amplifiers.  When playing with Isis, Turner and his fellow guitarists usually tuned their instruments (low to high) B-F#-B-E-G#-B, to achieve a heavier sound. They also used other tunings, though less frequently, such as F# (octave below)-F#-B-E-G#-B.  In 2016, Turner described the live rig he used with SUMAC as consisting of two custom-built guitars from the Electrical Guitar Company. Both have lucite bodies and aluminum necks, and custom-wound wide frequency range pickups. The newer of the two--a prototype for a signature model--has a slightly flatter fingerboard radius than the older instrument. On a tour of the Eastern US, Turner was using an Orange Dual Dark 100 amplifier head with a slaved Fryette Two/Ninety/Two power amp. Both heads drove Orange and Marshall cabinets, though Turner claimed to have no strong preferences for particular speaker cabinets. While recording, Turner prefers to use a Fryette Pitbull Ultra Lead, an amp model he's used consistently since his work in Isis. Turner described using a variety of effects pedals in his live rig. Specifically, he runs a BOSS TU-3 Chromatic Tuner, a Death By Audio Apocalypse fuzz, a MASF fuzz, a Strymon BlueSky reverb (which he described as the one essential pedal in his rig), a TC Electronics Ditto Looper X2, and an EHX Forty-Five Thousand sampler (used to trigger preset samples during performance. Turner prefers a Heil PR20 vocal microphone.
Question: What is an example of a guitar effects pedal that he used?

Answer:
), played through various effects (his pedalboard layout changed every gig depending on what songs the band decided to play that night),