Post fader not only for main out

Hi,

on my CQ18T in the output routing I can choose between pre and post fader.

I would like to be able to select for post fader mode that a specific output is chosen. I.e. I want to send only post fader for my out 1,2 and if master out is set to 0 - nothing is sent. Only if that is also pulled up.

Is this something I can change? Or would this require a new firmware?

Background: The audio is sent just fine in both modes to the output. However, the headphone output - when set to output 1,2 will ONLY work in post fader mode if the master out is up. Ideally I can select the output (i.e. 1,2 here) and then the post fader should apply for that particular output.