tascam dr-100 digital audio recorder
Adjusting the input level
Press the RECORD key to put the unit in recording standby. Set the MIC GAIN to H (High), and adjust the INPUT volume so that the level meters extend as far as possible without causing the PEAK indicator to light.
If the level meters do not extend very far even as the INPUT volume setting approaches 10, set the MIC GAIN to H. On the other hand, if the level meters stay extended even as the INPUT volume setting approaches 0, set the MIC GAIN to L.