I found the thread about the PSR2000 mic in being mono. (BTW
I checked the available specs for the Technics KN2600 and it only says mic in.

My guess is that it will be the same as the PSR mono in and the Technics will probably sound much better going out in stereo if they do the effects like Yamaha, which I don't know for sure. I may just have to try it to find out.

Scott