X20/X20S and Ethos v1.5.0 User Manual
x > 0
If the source value is positive, then the curve output follows the source.
If the source value is negative, then the curve output is 0.
Offset
Note that all curves can have a positive or negative offset which will shift the curve
upwards or downwards on the Y axis.
x < 0
If the source value is negative, then the curve output follows the source.
If the source value is positive, then the curve output is 0.