Hi-Fi Sound - Hitachi VT-F482A Owner's Manual

Getting Started (Initial Setup)
Use the MONO setting when the stereo signal is not strong enough for
quality reception (for example, when there is signal drift or noise).

Hi-Fi Sound

Hi-Fi sound is the same quality as that of a compact disc player. Its
dynamic range of over 90dB will record either stereo or monaural
broadcasts with the highest quality possible. Linear sound, on the other
hand, will record monaural sound using the same format as a non hi-fi
VCR. Stereo programs are recorded in hi-fi on both the left and right
channels and also recorded on the linear track as monaural.
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