The note changes interval to interval. The same interval has the same 3rd note on different guitars.

Okay, but which one should I buy? None of the pedals I found is so short on general compressor artifacts than the Keeley. And it is very player friendly, apart from the intermodulation. I have tried the Distressor Plugin as well, couldn't set it so well like the Keeley. So this is both about challenge to use and what features it offers. I have ideas which one should I buy, some are a bit pricey, but why I am not rushing to buy them is because the ones I bought so far had also been praised by many professional musicians and users (the Demeter or the Carl Martin), or the maker advertised itself as a group of geniuses. And then when you got the product the story was no more that happy.