Kurzweil K2661 Musician’s Reference Manual page 303

SCTrebFreq The center frequency of the side chain treble shelving filters in intervals of one semitone.
SCMidGain The amount of boost or cut that the side chain parametric mid filter should apply in dB to
the specified frequency band. Every increase of 6 dB approximately doubles the
amplitude of the signal. Positive values boost the signal at the specified frequency.
Negative values cut the signal at the specified frequency.
SCMidFreq The center frequency of the side chain parametric mid filter in intervals of one semitone.
The boost or cut will be at a maximum at this frequency.
SCMidWidth The bandwidth of the side chain parametric mid filter may be adjusted. You specify the
bandwidth in octaves. Small values result in a very narrow filter response. Large values
result in a very broad response.
KDFX Reference
KDFX Algorithm Specifications
10-221