filter routing - parallel - does it work?

[coredump]

Hi - I am new to pigments but been messing around with synths for decades!

Just bought it and was playing with the filter routing - I created a new default patch and enabled filter 2 with formant and disabled filter 1.

Filter 1 volume set to zero.

Set filter routing to "SUM" and fully parallel "f1//f2" which I thought just blended the 2 filter outputs - in this case because filter 1 vol is zero I should just hear filter 2 output.

But all I hear is a click.

What am I doing wrong?

thx

[coredump]

ignore me - I found the "filter mix" knox in the engines.