Sony ICD-SX77 - Manual (Page 57)

ICD-SX57/SX67/SX77 GB 2-894-352-12 (2)
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Menu items Settings (*: Initial setting)
USB CHARGE Sets whether batteries will be charged using a USB connection or
not.
ON*:
The batteries will be charged.
OFF:
The batteries will not be charged.
Note
If you use a USB AC adaptor (not supplied) to connect the IC recorder to the
AC outlet, you can charge batteries regardless this setting.

V-UP LEVEL When the VOICE UP switch is set to “ON,” set the sound level to be
amplified so that the inaudible low-level part will become more
audible.
MAX*:
You can adjust the VOICE UP level more effectively.
MID:
You can adjust the VOICE UP level less finely.