Hmm. I thought that all electret microphones were condensers...

What we do need to know is which parameters are important for this use. We know that we don't need a response beyond 15KHz as the sampling rate is 29.4KHz, although a microphone with an extended range may be flatter for longer. What what about the low end? The Maplin model goes down to 50Hz. We know the DSP is capable of EQing lower than that (17Hz IIRC), although it was limited in software (to 50HZ IIRC). How low does the autoEQ measure?

Is the sensitivity important? Presumably, because the software doesn't know anything about amp gains, it cannot make any assumptions about the audible volume vs the empeg's logical volume. As such, I would also presume that the software has to be fairly smart and would level the frequency response to the average volume, without caring what that volume actually was, hence making the sensitivity of the microphone non-critical.

Voltage and impedance requirements? The Maplin one is 4.5V (optimum) and 1Kohm. How much variance is acceptable?