[Elecraft] K3 and the digital modes

[Lynn Lamb, W4NL]

Pardon for a dumb question, but I've hit that wall... again!

I talked to Dale at Elecraft and he suggested some of you may know the 
answer as he had no experience with hooking up and making K3 work with a 
computer so it will work using the sound card to have a full array of modes, 
etc.

Guess I misunderstood how the K3 did this and purchased the serial to USB 
cable at the time the K3 was ordered and it does the trick relative to 
downloading the firmware and very well.  I expected this same cable to give 
me all the audio in and out plus key the rig.  It doesn't at this QTH and 
Dale suggested I use a serial to serial cable which I tried and it doesn't 
work either.  So that is where I'm at tonight.. dead in the water, hi.

Has anyone done this and if so PLEASE share it with me?

If I'm missing something I should know please tell me too -- I can handle 
it, but I've got the book memorized!

I use MixW and FLdigi on other rigs and they work fine, but the K3 is where 
I'd like to do the digital modes.

Thanks, lynn W4NL