According to the descriptions from Zoom, the H2 can bi used with four different mic patterns:

Front 90° Stereo, (X/Y 90 degrees using the two forward facing mics)
Rear 120° Stereo, (X/Y 120 degrees using the two backward facing mics)
Surround 2ch Stereo, (where the front and back left mics are mixed together, and the front and back right mics are mixed together)
Surround 4ch, (where all mics are recorded in two stereotracks.)

Now this seems very useful and good, but I just stumbled over the microphone "Line Audio QM12 Quad" (which you can find here http://www.lineaudio.se/linemic.htm). This mic, which is much more expensive, and most likely much better than the H2, still shares some propertes withe the H2, it has four mic cartridges arranged in 90° apart, which is very simmilar to the H2.

The interesting thing was that for the QM12 there were many more mic patterns described here:

http://www.lineaudio.se/qm12man.htm

They are achived by phase reversing some of the mics. I think I understand how this works. Sound that arrives at two mics, with different phases, with the same amplitude are canceled out. and so on.

Using this they achive several more, including

Figure eight (mono), I.e. front and rear but nothing from the sides

Crossed figure eigth (2ch), i.e. all mics, front left and rear right mixed togheter, and frong right and rear left mixed toghter. The idea is that you get little "overlap" between the mics, i.e. each mic gets a very directional characteristics.

Questions.

Do you think that this would work on the H2 as well? The description for the QM12 says that the phase reversing should be done in a mixer or using crossed cables, but could this not be done after the recording in a audio editing program, like Audacity, as well?

The other thing that might complicate matters is that the QM12 hav all four cartridges on top of each other, which means that the distance to all cartridges is the same regardless of where you stand in the room. The H2 have them arranged one or two cm appar in a square instead. Does this spoil the phase reversing trick, do you think?

This might be possible to fix, along this lines of what this guy did.

The fact that H2 does not have a pure 90° arrangement of the mics might impact this as well, but it seems to me that it should still be possible to achive similar effects.

Unfortunatelly, I do not yet own a H2 (or a QM12 for that matter), but I plan to get one very soon.

/Andreas