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Elsewhere in this issue is my review of the Groove Tubes MS encoder, which was designed to be an M/S to L/R encoder for recording with Mid/Side microphones. The Sonic Orbit accomplishes the same task, but unlike the rackmount encoder from GT, Peter Engh's is 100% passive and is enclosed in a high-quality, 5.25' x 3' aluminum-alloy project box. Instead of op-amps, the Sonic Orbit employs two transformers (wired point-to-point) to do the math": Left = Mid + Side; Right = Mid -Side. You feed it the outputs of the Mid and Side mic preamps and out comes a stereo pair (all via Neutrik XLR connectors). An unbreakable