I know you need all the hidden voices but do you need the voices you get from the hint boom box and the narrators lines

You need to trigger every "hidden voices".

hey so in voiceline% in train how do you see everything very well?

i turn off shadows when running voiceline%

Turn your graphics on very low in the settings for voiceline% And there is a glitch when you get to level ice where the graphics go up to low and you can't change it so you gotta restart the game for it to become very low again and its annoying