According to the Renoise / Redux manual – Audio Effects, section 1.5.4 - Scream Filter (redux only) – there is supposed to be a ‘scream filter’ device inside Redux.
Problem is… it’s not there!
I’ve included a screenshot of the effect selector menu in redux… there’s no sign of Scream Filter anywhere? Is this a bug, or am I missing something?
the scream filter is nothing more but a rectified output version ( absolute value ) of a regular low pass filter
You can mmickk it by inserting a low pass filter followed by a distortion device set to shift mode