There is, go to http://www.har-bal.com (short for harmonic balance) and you should be able to find a demo. However. I wouldn't expect it to end up sounding like it has come out of Abby Road !

You might want to suggest to the dude doing the recording that a pair of matched stereo mikes wouldn't break the bank !

Even the oldest reel to reel tape recorders have a left and a right input !