These buttons select dither bit resolution. In general, set this control to the maximum bit resolution of your destination media.
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16-bit is recommended for output to digital devices such as DAT recorders and CD recorders since they have a maximum resolution of 16 bits.
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18-bit is recommended for output to digital devices that have a maximum resolution of 18 bits.
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20-bit is recommended for output to digital devices that support a full 20-bit recording data path. Use this setting for output to analog devices using an 882|20 I/O audio interface. It is also recommended for use with digital effects devices that support 20-bit input and output, since it provides for a lower noise floor and greater dynamic range when mixing 20-bit signals directly into Pro Tools.