Sony PCM-D10 Help Manual page 190

Help Guide
Linear PCM Recorder
PCM-D10
You cannot change the volume of the connected Bluetooth audio device from the linear
PCM recorder.
Depending on the connected Bluetooth audio device, you cannot change the volume of the device from the linear PCM
recorder.
Some Bluetooth audio devices do not support volume operations in Standard mode. Disconnect the Bluetooth connection.
Select [ Bluetooth] - [Audio Device] - [Volume Control] - [Enhanced Mode] from the HOME menu on the linear PCM
recorder, establish a Bluetooth connection with the device, and then change the volume.
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