RATIO.
Sets the ratio of the compressor; The range depends on the compressor model se-
lected.
SIDECHAIN EQ.
Press this button to activate the sidechain EQ function. The sidechain functions are con-
venient in many applications, for example, it is possible to separate certain vocals and
instruments from a mix using frequency-weighted compression thanks to the included
3-band EQ (plus HP - LP cut filters) in the sidechain path.
EXT SC.
The EXT SC (external sidechain) button enables use of an external source as the signal
feeding the compression detector circuit.