Reach out to the artist and ask him/her/other. He may be flattered.
I remember asking Peter Steele how he got his incredible sustain and he spent a while describing literally every piece of gear he uses. Like most of us, he enjoyed talking gear with another bass player.
Now conversely, when I asked Dennis Dunaway about his equipment, he said "buy my book".![]()
Custom Fernandes sustainer! I love Pete's sound, he was a total one off <3