A multi-beam scanning device includes a multi-beam light source unit that emits a plurality of light beams having different wavelengths. The pre-channelized spectrum analyzer has a polyphase filter that channelizes a signal input and an IFFT that generates filter bank outputs derived from the channelized signal. A curved, semi-rigid diaphragm support is carried between the seat frames in alignment with the curved shape of the seat frames and mounted for movement relative to the seat frames between a first, upright position and a second, reclined position. In an embodiment in which the spool is rotated in timed relation to the feed from the extruders, the output is twisted along the central axis to form a \u201cbarber pole\u201d stripe arrangement. The folding sequence may be imparted to the paper using printing or scoring or both to yield the diagonal lines on which folds are made.