My uncle found three boxes of cassette tapes at a garage sale a couple of days ago and when we tried to play them the voices on the tapes were high pitched and fast. I was wondering if there was anyway to change the voices or at least slow them down. The cassettes are all TDK Type 1 D90's and I believe they are normal bias. Also I believe these tapes were used by a lawyer for either dictating purposes or for meetings with his clients. Any help would be greatly appreciated.