Avex iPhone Video Converter 4.0 Online Manual
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Audio Settings:
Audio Codec
Audio codec is pre-defined in each of the profile you've selected. Usually, you don't need to change this field.
Audio Bitrate (in Kbits per second)
Audio bitrate refers to how much data is allocated to store audio signals. The higher audio bitrate, the better audio quality. There are some other factors that influence the audio quality as well, such as audio sampling below.
Audio Sampling (in Hz)
Audio sampling means how frequently an audio sample is retrieved per second.
The average human ear can hear sounds in the frequency range 20-20000Hz. To reproduce a sound at a given frequency, the audio sampling rate must be more than twice that frequency. An audio sampling frequency of 44100Hz is normally good enough to have cut-offs above normal human hearing range. (Telephone lines use 8000Hz audio sampling. It is good enough for human voice, but not enough for music with high frequencies. )
Audio Channels
1 means Mono; 2 means stereo.
Audio Volume:
You can change output audio volume in "Options" menu -> "Output Settings" dialog. The default volume level is 5 (original volume).