[Elecraft] KX3 Audio in Problem

[Barry LaZar]

I know I'm overlooking something really obvious, but I'm having a 
problem sending audio from my laptop to my KX3. I've just received my 
cables from Elecraft that should allow my inputting of audio data in to 
the mic input for use with transmitting PSK31. What the problem is that 
when I put the cable into my laptop's line out, the transmitter is keyed.

OK what did I miss? I know I tired.

73,
Barry
K3NDM