Sony PCM-D10 Help Manual page 176

Help Guide
Linear PCM Recorder
PCM-D10
The volume of the audio you recorded from an external device is low or you hear
squeaking noises when you listen to the audio via the built-in speaker.
If you record audio from a monaural external device that is connected to your linear PCM recorder with a stereo connection
cable, playing the recorded files may sound low in volume or make squeaking noises when you listen to the audio via the
built-in speaker. This is because the left and right audio signal output is reversed in phase, and does not indicate a
malfunction.
Be sure to use an audio cable with a monaural plug to record audio from a monaural external device.
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