Effect · 1 CPU unit
Try the knobs, live
Doubler
by Chirp · CC BY 4.0
Sounds like the part was played twice and panned apart, as studios did with automatic double tracking: a copy slightly out of tune, a few milliseconds late and drifting a little, on the other side from the original. Width spreads them apart; at zero both sit in the middle for a thick mono double.
How it's wired
soundfed back (a loop through a delay)moves a setting
Open it in Studio and click Edit inside to change any of it, and hear each change as you make it.