I had a chance to actually test pichlo's version today - while measuring from "microphone" source looks like working (sound lvl fluctuate a little), it actually doesn't seem to. The 19-31 dB sound lvl stays the same in complete silence and while I'm making all kind of noises, or even play a song from N900's own speaker at max volume. Furthermore, while ~20 dB is "silence", it jumps to 31 on graph, on steady period (initially, thought that it measures my heart rate, but it looks the same even when put on table, so...).

I'm curious, if it's just me, or someone else is experiencing same things? Just for the record, my microphone is working fine for all other things, of course.

/Estel