BSS Audio FDS 355 User Manual page 31

Frequency Turning the parameter wheel adjusts the EQ frequency. The filter position is
shown graphically by the cursor, and the Frequency of EQs can range
between 15Hz and 16kHz.
Turn the parameter wheel clockwise to add boost (+ gain) or anti-clockwise
Cut/Boost
for cut (- gain). Cut/boost is available between +15dB and -15dB, in 0.2dB
increments.
Width Turning the parameter wheel clockwise widens the EQ (lower Q),
anticlockwise makes the EQ narrower (higher Q). EQ Width is available
between 0.05 and 3 Octaves, in 0.05 increments.
31