I use Auto Call Recorder. If I record in AMR format, it records perfectly, but if I change to WAV or 3GP then it sounds like is like fast squeaking voices speaking. I can’t get anything out of it and I need it for filing a case. Emergency!
What to do and how to hear the WAV file?
You could try an audio converter such as http://audio.online-convert.com/convert-to-mp3 .