Not sure about how trim works in PT but in digital consoles, especially consoles networked through Dante or AES, it acts more like gain. Changing trim won't change the gain settings on the actually preamp but if your sending signal to something like a compressor or reverb, lowering the trim will effect how much signal hits your compressors and/or reverbs. Where as, the fader on the console controls the volume without effecting the signal being sent to your compressors and effects. I.e. eliminating the dry signal while you still here the wet signal. Granted, this is all kinda dependant on if your sends are set up as pre fader or post fader.
Not sure about how trim works in PT but in digital consoles, especially consoles networked through Dante or AES, it acts more like gain. Changing trim won't change the gain settings on the actually preamp but if your sending signal to something like a compressor or reverb, lowering the trim will effect how much signal hits your compressors and/or reverbs.
Where as, the fader on the console controls the volume without effecting the signal being sent to your compressors and effects. I.e. eliminating the dry signal while you still here the wet signal.
Granted, this is all kinda dependant on if your sends are set up as pre fader or post fader.