It is maybe 12x15x4. Much bigger than any of my pockets, and pricey too. But the audio that I get out of it blows away anything coming from my cams. It is most useful when the house is using a board, and I can run lines into the Korg from it.

I have also used my wireless mics with it, running the line out from the reciever into the line in on the Korg.

I believe that there are also similar products from Zoom, for a few hundred less.
Keith

Since we are talking about MD players/recorders...

I have a brand new Sony MZ-R909 MD unit for sale or trade.
Look in the classified section for details if you are interested.