I just said that to a friend today. Having one earbud in playing something or just the muffling of surrounding sounds helps my stutter a ton. Sounds throw me off bad when I speak, like I’ll be fluent and then a loud distracting sound happens and it discobulates my system somehow. There’s a device that you can buy that fits in your ear that echos back your own voice that apparently has the same effect. I’ve never tried it because of the price but I think the earbud trick is similar.