My favorite “cheap” ear plugs are Dubs. They’re comfortable, and they reduce the decibel level without reducing the quality of what you hear. https://getdubs.com. Source: over 1 year ago

They could be dubs. Back when I was regularly attending concerts I had these low-pass earplugs that are designed to reduce the hearing damage from stadium-grade speakers without impacting the sound quality (too much). Source: over 1 year ago

Https://getdubs.com/ Link is for what I have but doesn't look they are around anymore. I've had them for a while. I love those ones, but they are also the only I've ever tried so I won't claim any expertise. Source: almost 2 years ago

These are the DUBS I mentioned previously. They're pretty much invisible. I bought them many years ago from Amazon but today I get zero from the search results. So better order from their own website. Source: about 2 years ago

Mine were a gift from another musician I play with, so he got me pink ones. They're sold out on Amazon, and the website https://getdubs.com/ directs you to Amazon when you click on "shop now." There are lots of options, https://www.musicradar.com/news/best-earplugs-for-musicians has some popular ones. I know earasers is on that list and a lot of people like those. Source: about 2 years ago

He needs some kind person that would take the time to explain him how to that kind of "migration", also explaining him what is the difference between doing this and a low level copy with Clonezilla or PING. Source: about 2 years ago