[Elecraft] KIO3B Problem

[N7QS at aol.com]

Hi Elecrafters, I just installed a KIO3B in my K3, SN8214. Installation was 
 easy, and I have it connected via the USB port to the computer.  I'm 
trying  to use it on digital modes: PSK31, PSK63 etc, using DigiPan and WSJT  
software.  The receive function is working perfectly; as a matter of  fact, it 
copies received text better than any other rig/software combination  I've 
ever used. The problem is that I can't get it to transmit.  The  software is 
sending the tones; when I switch to the sound card in the computer,  I hear 
the transmit tones coming from the computer speakers, but when I switch  to 
the sound card on the KIO3B, there's no output, even when I manually switch  
the K3 to Xmit.  No indication of power out or ALC action, and nothing  
heard on a second receiver. I went down the configuration list and made sure  
everything is set-up properly, as far as I can determine.  I'm running out  of 
ideas here, can anyone help?
 
73, Doug  N7QS