Y-cam Black SD User Manual page 28

[Volume] Adjusts the sensitivity of the microphone from 0~14 where 0 is the lowest.
[G.726 bit rate] Four options: 16, 24, 32, 40(kbps). Determines the quality of the audio being transmitted.
The most commonly used mode is 32 Kbit/s.
[AMR bit rate] Determines the quality of the audio being transmitted to mobile phones using 3GPP.
Note: Higher bit rates are useful in noisy conditions, although lower bit rates provide reasonable quality for voice
frequencies.
Once you have set your required settings, click Apply.
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