Quote:
So, what kind of microphone should I immediately go out and buy?


Development was made with a "Ultra-mini electret insert" from Maplins (part no QY62S)

It's only reasonably flat between 50 and 13kHz, and they don't currently have the exact curve, but working on it -- if there's someone out there with a good reference mic and measuring gear, they could reportedly help out...
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/Michael