>> OK, so here's an irritating problem...
>>
> Maybe this microphone is an electret one and need to be powered (whitch your 
> motherboard microphone input does but not your additionnal soundcard)
> Maybe you need to switch something like 'plugin power' somewhere (either 
> hardware or software switch).

Actually I'm pretty sure my PC microphone is a crystal mic...

[The microphone that works is marked as "dynamic", whatever that means.]

I had a go with my dad's test meter. At 0 Hz, the working mic has a 
resistence of about 600 Ω, whereas the non-working one is about 1.2 kΩ. 
I don't know whether that has anything to do with anything. [I don't 
have the specifications for my outboard sound card to hand...]

-- 
http://blog.orphi.me.uk/
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