PFL TRIM releases when unPFLing a source back to the Set Main to PFL source at the wrong time resulting in a big level jump in your PFL.
I found this whilst PFLing an input, having used the PFL trim to reduce the PFL level to match the level of my Set to PFL source volume. I wish I could push the Send to PFL source trim level above 0db as this would solve my issue. I also wish I could pan my PFL source just like I can my source to PFL and if I could pan my PFLexternal input, so this would allow me to pan my PFL to the right, my talkback group external input to the left and my default PFL source to the right and not have to send my PFL to an input and then use a Matrix to do the panning and use an external headphone amp to achieve what I need in having comms in one ear and PFL/Program in my right ear / wedge. Lets get the PFL as a fader and the Wedge as stereo whilst we are at it and let me choose what the source for the headphone amp is whilst we are it!