When I've tried, I haven't had good success - but it's been mainly because the noise floor of my figure 8 mic is pretty high in comparison to the dynamic that I used for the cardioid.

I've recently come into a couple different dynamic mics that I'll have to give a try as the mid mic. Still have the same figure 8 mic however.

Here's a quote from the article that highlights my problem: "For the most part, both mics should be fairly similar in sound. This is particularly true when the sound source is large, like a piano or choir, because the channels are sharing panning information; otherwise the tone quality will vary across the stereo field."

I have better luck on acoustic guitar just with a simple condenser in the usual way - around 12th fret, backed away, pointing to the sound hole. Not stereo, but I usually don't need it that way.

The other thing is that you have to ensure you can setup your signal flow like the one shown. If you don't have a way to copy and inverse phase the figure 8 mic signal - then don't bother with M/S.

-Scott

-Scott