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Does the MxB take a high impedance input like from an electric guitar?
There is a high impedance setting on the back:
"5. Input Type (Inst/Line) - For external instrument, use Instrument level for Hi-Z sources like
an electric guitar or bass; use Line level for sources such as another electronic instrument,
mixer output. This is an unbalanced input. Line = 68kΩ. Instrument = 1.1MegΩ"