Trey Azagthoth

Trey Azagthoth uses the Boss GE-7 Graphic Equalizer, as evidenced by a user-uploaded photo on Roland's website.

Trey Azagthoth of Morbid Angel used the DigiTech WH-4 Whammy pedal during the production of "Illud Divinum Insanus." This is supported by the image titled "Whammy_original.jpg" from Harmanpro.

Trey Azagthoth used the MXR M101 Phase 90 phaser pedal on his pedalboard during the "Altars of Madness" and "Blessed Are the Sick" eras, as shown in a user-uploaded photo on Equipboard.

Trey Azagthoth uses the Boss BF-3 Flanger, as shown in a user-uploaded photo on Roland's website.

Trey operating his pedalboard which includes a Morley Bad Horsie Wah pedal.

Trey Azagthoth uses the Ibanez AD-80 Analog Delay, as detailed on Tonehome's page dedicated to vintage guitar effects pedals.

In a 2004 Instagram post showcasing Trey Azagthoth's pedal setup, a Washburn A-F4 Flanger is visible, indicating its use alongside other effects like the MXR Phase 90 and Morley Bad Horsie Wah. Despite the caption mentioning a Locobox Flanger, the Washburn unit is clearly distinguishable.

He said it in an interview with By Jon Wiederhorn (Guitar World) December 29, 2017.

https://www.guitarworld.com/artists/trey-azagthoth-explains-how-morbid-angel-righted-the-wrongs-of-the-recent-past

Trey's rig which includes a Univibe.

At 1:24 you can see the pedalboard with the EVH flanger.

https://www.youtube.com/watch?v=C_daXOmfxLs&t=623s (In future include a time stamp so we don’t have to go searching)

Trey Azagthoth uses the Electro-Harmonix EH-7900 Micro Synthesizer, as detailed on the EHX website.

Trey Azagthoth used the Electro-Harmonix HOG Harmonic Octave Generator in the studio for Morbid Angel's "Illud Divinum Insanus" album. This usage is documented on the Electro-Harmonix website.

This pedal is visible at the 01:38 mark.