I don't have a 670.
Just saw things on YouTube.
I guess back to the manual.
I usually download them for quicker reference. ...
Good luck
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Compact, Electro-Voice ZXA1 Subwoofer