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Message: <blockquote data-quote="kc2eeb" data-source="post: 114018" data-attributes="member: 811">The series and parallel send and return jacks are line level. So if you go out of the send jack (series or parallel) and into the front input jack of the amp there would, of course, be a huge level mismatch.  Bruce sold (and maybe still is) a box that allows you to change the levels, either up or down, inst. to line, line to inst. and anything in between.So, series out to the matchbox, out from matchbox to guitar input jack of RM4,RM4 into matchbox, matchbox out to series return.You have to play with all the levels. You can make it sound terrible if you just dime all the levels, way too much gain.</blockquote>