8 bit resolution on 12 kHz sampling is low fidelity (but OK if you just want to tell the
difference between a car and a dog).
It is of course nice to have "full CD quality" on all your recordings, but it will use a lot of the memory
in the instrument. (Up to 16 times more, and memory is running fast.)
48 kHz sampling rate is ideal for quality recordings. Use this selection if the recording shall be analysed later.
Be aware that 48 kHz sampling rate is only available when you do recordings in only one channel.
The Nor145 measures the whole dynamic range in one span without any gain adjustment. The full scale with a
normal microphone is 140 dB. If the level is low, like speech, adding a gain (e.g. 24 dB) will make it much easier
to use the recording in a playback situation later.
Please note that adding gain to your recording implies that there can be unrecoverable overloads in the file
and that background noise will be more audible. In fact the dynamic range will be reduced with the gain setting.
You can select up to two minutes of pretrigged recording. This is nice to get a recording of what is
happening just before you or the instrument are aware of the noice.
You select which in which channels you want recordings.