when playing back recordings.
One voice is slow and incomprehensible.
Not all recordings.
What is your phone name and model and Android version?
SONY XPERIA Z (6603) Android 4,4,4,
Please remove any other call recording app, go to phone settings and
find "Call Settings" and "Sound Settings" section and disable
"Microphone Noise Suppression", "Clear Phase" , "Speaker Voice
Enhancement" and "xLoud"
Don't forget to increase your star rating once issue resolved :)