someone just gave me a wonderful idea that works .
what you need
1.A cassette adapter that has one of those cords coming out[ used for old cars to play cds or ipods through the cassette player.]]
2.this isn`t cheep but look on ebay. a tape duplicator. it copies tapes at 16x the speed.
3. a program like goldwave.
what you do
1. put in the original side of the duplicator your priginal tape.
2. put in the copy side you adapter matzav.
3. set the bit sampling rate on golwave as high as possable.
4.plug adapter into soundcard.
5. start copying.
7. slow it down by 16x.
this isn’t that good for music but is deffenatlly good for shiurim. like the tags say