That is exactly the same problem I was having. I started my copying/editing using Wave Editor in an older version of Nero. Last year in February we had a burglary and that computer and my files went out the door. Nothing has been recovered, but I replaced the computer and put in Nero again. I haven't gotten back to working with the cassettes, but I did resolve to make it easier on myself by running cable from the good receiver with the equalizer in the other room to the computer. Eliminating as much hum and buzz at that source as possible should help. The cassette player I used at first was part of a compact multiple system unit but it had few settings to deal with the noise.

I'm planning to get back into some of that work soon, so I'll report back with my results.

SRS