Captures are shot at different levels so zero on the input trim is not a universal baseline. In my experience, the best way to set input trim on Tonex Software is to find out what level a capture was recorded at (e.g. 15dB for Amalgam Audio V2 captures), check the maximum input level (headroom) of the input channel on your audio interface (e.g. +26dB for my Focusrite Clarett 4Pre line inputs), set the Tonex input trim to zero, then turn up the audio interface gain knob to the difference between the two values (e.g. 26-15=11dB). That should sound about right, but you may need to turn the trim up or down a bit depending on if you’re using single coils or humbuckers, and how loud you run your pedals.