It sounds like you've got the 'midi thing' covered properly. As long as you're able to fire up the Proteus units, don't worry about midi for purposes of this discussion. It's not a part of the audio path; just a control system.
Normally, for internal stereo sounds the Korg would feed L/R audio out to 2 channels of your mixer using 2 cables, or a single cable for mono use to 1 mixer channel. That's the basic setup. I took a cursory look at the MicroKorg, and it has AudioIn jack, which allow audio signals to come back into the MicroKorg for processing, then through to the MicroKorg's aforementioned audio outs. This AudioIn connection should accept the analog signal outputs from the Proteus units. To get L & R outputs of both Proteus units returning back to the MicroKorg, you'll need a small, 4 channel mixer, or only 2 channels if mono is OK. The output of the mixer would then feed the AudioIn jack.
Have fun, Paul
_________________________
WUDAYAKNOW.. For the first time in my life, I'm wrong again!!
| 
