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These settings adjust the audio input and output.

Input source
Choose the desired input source.
On Detect Source the device chooses the input with higher audio level during start up.
Default setting is "Mic".

Microphone gain
Choose the desired gain ("21" - "43.5" dB) for the microphone.
Default setting is "21" dB.

A/D amplifier gain
Choose the desired gain ("-3" - "19.5" dB) for the A/D amplifier.
Default setting is "-3" dB.

Loop Input to Output (MP3 only)
Choose "Yes" to hear the attached input on the local Line Out (For testing only, feedback may occure when using a speaker).
Default setting is "No".

Encoding
Choose between different encoding types (audio compression) and sampling frequencies.
From "MPEG1 / 48 kHz" down to "MPEG2 / 16 kHz" and "uLaw", "aLaw" or "PCM" at 8 or 24 kHz.
Default setting is "MPEG2 / 22.5 kHz".

MPEG Encoding Quality (MP3 only)
Choose between "0 lowest" and "7 highest" in steps of 1.
The Encoder Quality table below shows the average bit rate in kbit/s for the quality settings and sampling frequencies in kHz.
Default setting is "0 lowest".

Qual. 0 1 2 3 4 5 6 7
44.1 65 68 73 80 90 105 125 140
22.05 35 38 40 45 50 60 75 90

Volume
Choose between "0"% and "100"% in 5% steps.
Default: "50"%

Bass
Choose between "-10" and "10".
Default: "0"

Treble
Choose between "-10" and "10".
Default: "0"

Loudness Level
Choose between "0" and "20".
Default: "20"

Loudness
Choose between "0" and "20" and switch the Loudness "On" or "Off".
Default: "Off"

MP3 Frame CRC
If set to "enable", the encoder will include the CRC-16 to each MP3 frame.
Default setting is "enable".

MP3 Bitreservoir Mode
The Bitreservoir is used to compensate the differences between the predefined frame sizes. If set to "used", the encoder will use the bitreservoir.
Default setting is "used".

MP3 Copyright Protection
"Enable" or "disable" the copyright protection bit in the MP3 bitstream.
Default setting is "enable".

MP3 Stream Type
Select between a "copy" or an "original" bitstream in order to set the appropriate bit in the MP3 bitstream.
Default setting is "copy".

MP3 Emphasis
Select emphasis "none", "50/15 us" or "CCITT J.17".
Default setting is "none".