What do you think of the quality of various brands of cassettes that you have kept for decades? It was not what I expected when I bought them......Ampex brand squeel.....Memorex jam.....Radio Shack Supertape is very good but Concertapes sound muddy, more so over the years....Kmart cheapo 3 for $2.97 are good......some off brands like that were super cheap still sound good. So why are some of the more expensive tapes so bad? TDK and Maxell are still sounding good but since they cost more I expected that.