Marquesas (one of my favourites) were stereo from the very beginning, and I like them plain (no traces, no jumping, just somewhat smoothed mirrored spectrum plot). Hm, I have to check whether it is still in the wrong menu (among 'scopes insead of spectrum stuff)
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Dragi "Bonzi" Raos Q#5196 MkII #080000376, 18GB green MkIIa #040103247, 60GB blue