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? My gtrs are BOTH in the shop, so I can't even test this out. Irritating. Thanks.