Doug,

Bring up the USB soundcard on your computer and look at the output (speaker) volume. Just how you do that is OS dependent so specific instructions are not possible at this point.
Make certain the "speakers" are not muted.

73,
Don W3FPR

On 1/21/2016 4:40 PM, Doug via Elecraft wrote:
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?

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