Is it possible to feed the mic input through the headphone jack? In other words, did Nokia either a) design the headphone jack with a 4 conductor connector (like a camcorder's audio/video connector), or b) did they make a software switch that switches the jack from stereo out to mono out/mono in (like some cellphones). The reason I ask is that I am interested in porting gmfsk, a program amateur radio operators use to communicate over shortwave to the Nokia. However, this at a minimum requires the ability to feed audio into the device for digital demodulation - using the microphone and "air coupling" would really NOT be the best way to go.
