Walter,
The SignaLink not only has a built in sound card, but it also controls the radio's PTT function. Yes, you can use VOX, but this plays a little less clunky. You can also use the KX3's built in abilities, but using an external interface with multimode software, allows for greater flexibility.

73,
Barry
K3NDM



On 6/9/2015 10:40 AM, Walter Underwood wrote:
You do not need an interface. If you do want outboard USB audio, you can do a 
lot better than Tigertronics for less money. But for most uses, the audio built 
into the computer is just fine.

More detail here:

http://audiosystemsgroup.com/USB_Interfaces.pdf

wunder
K6WRU
CM87wj
http://observer.wunderwood.org/ (my blog)

On Jun 9, 2015, at 6:52 AM, Bob N3MNT <b...@hogbytes.com> wrote:

If you want to use a program on the computer you need to add an interface.  I
sue and recommend this a signalink   http://www.tigertronics.com/  The have
an interface cable for the KX3 that makes the operation seamless.



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