No Mixer in 10 years Gary? Well, that's because your Kickapoo Joy Juice is active enough to mix itself...been known to dissolve plastic, I hear.

I've used the arranger's on-board speakers with a mic for many, many demos (and gigs), without a hint of feedback.

I can't see how it would be different with Scott's Korg (which is the main unit under consideration here), unless he's using an omni-directional mic....they don't work well for that application.

I do know Yamaha recommends a uni-directional mic for optimum results.

From what Scott has told me on Skype, his original intent was to eliminate an external mixer/amp entirely and use the Korg's on-board speakers, or headphones.

Ian