Dennis,
You can run get all the vocal effects, as well as the keyboard effects, EQs, etc from the keyboard, then just fire it directly into the L1. I wish I were there to help you set up the system, but unfortunately, this is not in the cards at this time.
Good Luck,
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.)