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Where does the LINEOUT signal come from in the amp chain?

working on my "stage computer" setup as described in ProAudio (and duely ignored...). Have an old practice amp (several) with a LINE OUT.
Where exactly in the chain is that signal coming from? Is it out at LineLevel?
real question is this- can i use the amp as a simple clean PREAMP before I send it to my soundcard from the LineOut?

HHHAAAAALLLLPPPP!

I have a modestly well-equipped mobile studio consisting of and existing around a Roland VS-2480CD,
a fairly well-designed rack system (if I do say so myself) with a 2ch. tube pre, 4ch. Comp,
4-12ch. Headphone Amp/Dist box w/Audio-Technica & Sony 'cans, 48-point Patchbay,
& Powered NFMs "on the side"...