Reply to Not too new tracks and bit rate

I love some older tracks, for exemple, a song called "Macumba Walele", and well, when I bought it, I saw that the bit rate is 192 kbps, and I had the same problem with other old tracks x.x

What do you use to do when you have to mix some tracks that are not 320 kbps?, do you use any "trick" to get a better sound quality?