The entire Barbetta series has multiple inputs, Bose has 4 on their L1 and newer systems, and the Peavey KB systems do as well.
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.)