Request:
since N900 has stereo recording functionality wouldn't it be cool if plugging an external microphone could trigger the recorder to make recordings from that?

I have a 3,5 mm TRS plugged stereo mic (which can be powered). So to do its work that would have to be in connection to the 3,5 mm output.

Problem 1:

• N900's 3,5 mm output is TRRS so this is not compatible with a TRS mic plugging in
  
  difference between TRS (tip, ring, sleeve) and TRRS (tip, ring, ring, sleeve)
  
  Solution 1: adaptor. Searching on the web I did find this: [ Droid Adapter 3.5mm 4 conductor TRRS Male to 3.5mm TRS Headphone Jack ]
  

Problem 2 (what it boils down to):

• how will the N900 be instructed to turn off the internal mic and record from the external mic?
  I guess in response to plugging the forementioned adaptor the N900 would do nothing until after proper firmware changes were made. Right?

Unluckily, there ends my understanding. Obviously the N900 recs from mic if you plug in the standard earphones, but would it be possible to record stereo mic as well?

Has anyone been succesful recording from a stereo mic?
If so, would that be using a TRS mic, a usb mic... (or whatever does the trick?)

I believe it is possible if you have a stereo Mic which use the same plug layout as the N900 plug.

Agreed that would be the optimal layout. That seems to be a perfect fit (hey but aren't all those TRS?). Wonder if the mic would have to be powered, too.

Too bad for my mic tho, I'm not going to try soldering it to TRRS. Those wires are too thin and I'd be ruining its integrity I guess.

wouldn't it be possible to use the video cable and only use the red and the white connectors with an adaptor?
or maybe then the n900 just "thinks" in video out and not in audio in...

Recaller records stereo, but doesn't get anything from a cd-player playing through the white+red connectors of the video cable

I'd be really keen to find some way for my n900 to record from a stereo external mike.

Not sure about 3.5mm mics, but USB mics should be possible once host mode is (fully) working.

ive semi-successfully used mic into TRRS on an N97, but it was flaky as it depended on what profile symbian would give you (headset, etc)

I would love to be able to connect n900 to a source of sound (a mixer or other device) and record stereo audio. The big problem I see is to tell the sound card to use one of the output channels as input like the mic one, so you would be able to record in stereo...

Sorry for resurrecting old thread, but I think it's better than starting new one, about same topic.

As notorious bootleg recorder, I'm very interested in possibility to connect high-quality stereo microphone to N900, and using it for recording purposes - as standalone audio, or together with video (729p, thanks to freemangordon).

As I understand it, there is absolutely not a chance to write software/kernel patch/whatever, that would "tell" device, to treat all audio out left/right (or video) as audio in left/right (fixme, if I'm wrong). So, only one option is to use USB microphone. Do we have any modules for that purpose in kernel already, or are there useful ones available for Debian, so Pali can add them without much hassle? How about compatibility?

I have 0 experience with USB microphones, up to date - left alone USB mic on linux - so Ithanks in advance for verbose info.

/Estel)