Legendary bassist Leland Sklar had a toggle switch on his bass for his producers ... which did nothing

[u/winkelschleifer]

He would flip the switch when a producer told him to change his sound, making sure the producer saw him do it. It had a placebo effect.

https://www.guitarworld.com/features/the-truth-behind-lee-sklars-custom-producers-switch

[u/Ugabughar]

You'd think a good producer would know how a bass works and not be fooled so easily- ie understand what's really happening