Mackie Profx12 mixer
This silent killer button is right on the edge, mid-way up the right
side , just where the ball of the right thumb would press , in normal
carrying.
In the troubleshooting section of the user manual, no mention of this
crass failure mode.
In the bit about the BREAK switch it does though say
"Check this switch first if you are having trouble with no sound in the
system"
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