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The only sanding machine that will move the paper in a linear fashion is a belt sander and they are super aggressive.
Festool make a linear sander - ie a pad sander that moves back and forth, rather than in little circles. Fairly specialist, and priced accordingly.
Nef-
I've got one! LS130. Everyone who's tried it has ended up buying one. They are really only necessary on bare wood but they are great for sanding mouldings, window cills etc.
Their best allround sander is the RTS400 in my experience but the LS130 is great to have. I did use their delta on staircases at one point but sold it when I got the RO90 which has a delta attachment.
Airhead
Random orbit sanders are designed to minimise the "pigtail" scratches that occur when sanders are used. If you are getting them when using a random orbit it would imply that either:
Sheet sanders are good but will give you more pronounced pigtail scratches than a random orbit and will not follow the grain as the pad moves in a circular movement. The only sanding machine that will move the paper in a linear fashion is a belt sander and they are super aggressive.