I found it on my S-950 but I didn't find it in the Manual - I discovered it by mistake. I'm assuming the 670 had the same OS.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)