To obtain the best audio results it is recommended to keep always the Wave slider at
the maximum level and to use the Master Out to adjust the output level.
NOTE: when a full-scale digital signal is played and the Wave slider is at 100%, it is
recommended to keep the Master Out slider at about 80%. Otherwise a distortion
could occour on the output.
This is a design choice: the internal gain of the output buffers are fixed in this way in
order to offer an extra-gain amplification in case of low level signals.
X2 Owner's Manual - Rev. 1.4 - page 15