Ok, finally found the article:
2009 Nissan 370Z's SynchroRev Match Explained - Tech Dept. - Car Reviews - Car and Driver
Quote:
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The gearshift sensors monitor gear position as well as side-to-side shifter movement and are sensitive enough that you can hold down the clutch pedal and watch the revs jump precisely to the right rpm if you merely hint at moving the shift lever to a lower gear. But it’s not just for downshifts; SRM also sticks the engine speed at the targeted rpm during upshifts to prevent any lumpiness that might result from letting the revs drop too low.
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