I think I mentioned the unbalanced part in an earlier post. I'm glad it turned out to be something so simple.
I must confess, though... at that price point, what on earth are Korg doing cutting THAT corner? That's a pretty ridiculous design decision, to make the mike in unbalanced on a $2000 arranger, when everyone that buys one is going to have a balanced, low impedance mike. They probably saved themselves $5 in parts. That's pretty much the definition of boneheaded!
The PA800 had a switched balanced/unbalanced input (automatic) TRS input... why did they mess with that?
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An arranger is just a tool. What matters is what you build with it..!