My Pioneer VSX-921 had the flashing MCACC light after a suspected power dip through the night.
Nor could I turn the amp on at all.
After reading multiple posts and trying multiple combinations pressing the "down arrow" and "multi zone off" together for 2 seconds reset the amp to a workable state.
Most audio sources don't have multiple outputs, however. You may find that you can simply use Y-cables to split the output of each source to drive your different stereo receivers. However, you may notice poor audio quality when you do that, depending on how your sources and amplifiers handle output impedance and input impedance.
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