To expand a bit on David's reply, the track faders have no effect on the input signal level. They only control the output signal of the track to the stereo bus. The stereo master bus meter will display the combined output signal of all 8 tracks, and if you solo an individual track, the stereo master bus meter will display the output signal of that track. This gives some ability to compare the input signal (shown on the individual track meter) and the output signal ( soloed on the stereo master bus meter).
Also, keep in mind the Source (A~H) Trim Knob is not a volume control. Yes, it will allow some adjustment of the input signal at the Source input jack that will be reflected by the track meter; but serving as an input volume control isn't its intended purpose.
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Going into the weeds a bit:
The Trim Knob is a variable pad meant to tame low impedance mic input levels. As it turns counter-clockwise, it decreases the Input jack's sensitivity. If it were a switch instead of a knob, it would be labeled "line" on the left and "mic" on the right, and have two midway positions labeled "mic -40dB" and "mic -20dB".
The Trim Knob is there to reduce the level of a hot low impedance mic signal, and in that context it impersonates a volume reduction control when moved counter clockwise from the full mic signal (right side) position.
If set initially to "Line" (for a line level High Impedance source), moving the Trim Knob clockwise will increase the sensitivity of the Input jack (thus increasing the input signal level), but it also changes the impedance of the Input jack. Full left is High Impedance (to match with a high impedance line level source); and changes to Low Impedance once moved off of full left, creating an impedance mismatch (high impedance source/low impedance circuit) which can have a negative impact both on the line level signal quality and the electrical circuitry.
There are some threads on this if you want to get into the tall weeds. A search on "Trim Knob" should find them.