OK, I tried connecting the Harmony-M output into the PSR-3000's auxiliary/line-level input and even with the Harmony-M's volume turned up there just was not sufficient power.
Now, it is well known that the Auxiliary Input of the PSR-3000 requires a fairly hot signal, so I'm not sure if this test will apply to the Korg Micro's line-in. It may be different and work just fine. When I do Thursday night's job I'll connect the interface, line-amp from Radio Shack and see if this makes a difference.
Cheers,
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.)