A LOT of bands and singers kept asking him about the fuzzbox effect and how to do it. They thought he’s selfish for not spilling but Greenbaum claims he cant exactly replicate it. It’s like asking Eddie Van Halen about tapping.
EVH took a lot of secrets to his grave. His "Brown Sound" from the early VH albums. Was it a stock Marshall Plexi? A modded Marshall Plexi? A variac? Ted Templeman's studio wizardry? Or just Eddie's fingers? He was never clear and often changed his story.
Can't blame him. That was HIS sound and he wanted to keep it.