nola,
from the user manual:
GAIN SELECTOR
The gain switch has three positions. The center position ensures the 0dB gain
(unity gain). In this case, the output level is equal to the input level. This could be of
help when the SX-M2 is used as an impedance adapter, or a balanced line driver.
The "LO" gain position allows 6dB to 40dB gain, and the "HI" gain position, 20dB to
76dB.
i always ran mine on lo, set between 11 & 1 o'clock, depending on how loud or
how close i was... onstage stuff was sometimes around 9-10 o'clock...