If it didn’t sound better, it probably didn’t need doing! it effectively puts it back to new. I tested mine against my friends Lingo 3 and there was bugger all difference. Easy test as it had the same cable so you could swap back and forth. When people say the 3 is a big increase over the 1, I think it is because they are comparing to a tired 30 year old unit. There was a slight difference (and I mean slight, it may have been perception) but I wouldn’t say it was better.