There are lots of phone apps that let you do it, but I’ve also got a preset I made on Audacity that has the delay that I find works best for me. Tomorrow I’ll have a look at what my ‘ideal’ delay is if you want. I usually wear earphones that have a microphone on them and turn the volume up loudly to drown out as much of my ‘real’ voice as possible. It’s crazy isn’t it! Also if somebody else says the word/phrase that I can’t say, I’m immediately able to say it as much as I want! Does it also work for you like that?