The maximum number of instruments I've fired through the system was two guitars (electric), a keyboard and two mics and had no problems at all. This was for an audience of about 50 people.

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.)