I can’t believe that we don’t have:
Pre ou Post fader per channell
Copy Mix from Master to IEM
Mute per MIX
Example, I want to have an IEM MIX in post as I need to controle the master and have both equal. But I have a click track.. I Can’t have it only in IEM mix without going to FOH.
The sound quality is great, but the features for a professional musician, working in a trio where SQ Doesn’t make sense.. the CQ looks like a toy 
Coming from a ui24r, this is so frustration…
I have the CQ-18T, so not 100% sure this applies to the 20B, but on pages 38-40 in the user guide it explains how to send signal to the various outputs.
I use in-ears with backing tracks and a click all the time and it works great.
Thank you so much, for helping out.
I figured out how to send as shown on the manual, but, do you have your IEM mix in PRE or POST?
Usually I use them in Post as we make our own sound and FOH sound with our PA. So, it is importante to be consistent between the IEM mix and master mix. I only want to block / send / mute or something the CLICK Chanell so we only listen on our IEM.
Let me preface by saying I’m just a musician and don’t really understand how any of this is supposed to work. I just fumble around and push buttons until I find something that does what I need. 
I’m using Out1 for my in-ears.
On the Config page, ‘Input Send Levels’ is set to ‘Pre Fader’.
On the Fader → Outputs page, ‘Out1’ is muted on ‘Sends to → MainLR’.
‘Out1’ is set to 0dB on ‘Sends To → Out1’. That way the click only ever gets to Out1.
Hope that makes sense and/or helps. Perhaps someone more knowledgable than me can chime in and confirm this setup, or correct any errors I have made….
Thank you. It does, and it is how it is supposed to work. But, As a musician that control and makes is own sound for FOH, it’s very importante to have post fader. More professional mixes allow this with ease.
Thank you so much!