Sony PCG-C1MVMP - Manual (Page 72)

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You can adjust the sound using the Smart Label software (included) or the sound
recorder.
Sound device Function
Telephony Adjust the modem or telephone line sound.
Microphone Adjust the internal or external microphone sound.
Line Adjust the audio equipment sound volume.
CD Audio Adjust the digital sound volume of CD of the
optional optical disc drive.
Stereo Out Adjust the sound from Volume Control. The bass
boost function is not enabled.