Sony PCM-A10 Help Manual page 224

Help Guide
Linear PCM Recorder
PCM-A10
Playback speed is too fast or too slow.
The DPC (Digital Pitch Control) setting is set to [ON], and you have changed the playback speed.
Set the DPC (Digital Pitch Control) setting to [OFF], or change the playback speed to normal.
Related Topic
Adjusting the playback speed – the DPC (Digital Pitch Control) function
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